Display device and a sensing system including the same

ABSTRACT

A display device including: a display unit having a plurality of pixels; a plurality of touch electrodes disposed on the display unit; a touch line connected to a first end of each of the plurality of touch electrodes; a common voltage line spaced apart from the plurality of touch electrodes; and a plurality of switching elements connected between the common voltage line and a second end of each of the plurality of touch electrodes.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority under 35 U.S.C. § 119 to Korean PatentApplication No. 10-2021-0105323 filed on Aug. 10, 2021, in the KoreanIntellectual Property Office, the disclosure of which is incorporated byreference herein in its entirety.

1. Technical Field

The present disclosure relates to a display device and a sensing systemincluding the same.

2. Description of the Related Art

A display device is an output device for presentation of information invisual form. Display devices are being increasingly used as theinformation-oriented society evolves. For example, display devices areemployed in various electronic devices such as smartphones, digitalcameras, laptop computers, navigation devices, and smart televisions. Inaddition, a variety of different types of display devices may beimplemented. For example, the display device may be a flat panel displaydevice such as a liquid crystal display device, a field emission displaydevice or an organic light emitting display device. Among the flat paneldisplay devices, in the light emitting display device, since tach pixelof a display panel can emit light by itself, an image can be displayedwithout a backlight.

A display device may include a touch sensing unit which recognizes thatan input has made from a user. The touch input may be from a pan of auser's body (e.g., finger) or an electronic pen. The touch sensing unitdetermines whether a user's input has been made, and calculates acorresponding position as touch input coordinates.

SUMMARY

Embodiments of the present disclosure provide a display device capableof securing reliability of a sensor over the entire area of a touchsensor area.

Embodiments of the present disclosure provide a display device capableof sensing a touch of an input member by using a touch sensing unit thatsenses a touch of a user's body, without including a separate sensorlayer or digitizer layer.

According to an embodiment of the present disclosure, a display devicemay include: a display unit having a plurality of pixels; a plurality oftouch electrodes disposed on the display unit; a touch line connected toa first end of each of the plurality of touch electrodes; a commonvoltage line spaced apart from the plurality of touch electrodes; and aplurality of switching elements connected between the common voltageline and a second end of each of the plurality of touch electrodes.

The display device may further include a touch driver configured tosense an input of a user's body by driving the plurality of touchelectrodes during a first period, and to sense an input of an inputdevice by driving the plurality of touch electrodes during a secondperiod different from the first period.

The display device may further include a display driver configured todisplay an image by driving the plurality of pixels during a displayperiod, wherein the display period overlaps the first and secondperiods.

The display device may further include an electromagnetic control lateconnected to a gate electrode of each of the plurality of switchingelements.

The electromagnetic control line may supply a control signal of agate-off level to the plurality of switching elements during the firstperiod, and supply a control signal of a gate-on level to the pluralityof switching elements during the second period.

The display unit may include: a substrate; a thin film transistor layerdisposed on the substrate and including a plurality of thin filmtransistors and the plurality of switching elements; and a lightemitting element layer disposed on the thin film transistor layer andincluding a plurality of light emitting elements, wherein the pluralityof switching elements are connected to the second end of each of theplurality of touch electrodes through at least one connection electrode.

The plurality of touch electrodes may include: a driving electrodeextending in a first direction in a first metal layer; a sensingelectrode extending in a second direction crossing the first directionin the first metal layer; and a bridge electrode connecting the drivingelectrode in a second metal layer different from the first metal layer,wherein the common voltage line is disposed in the thin film transistorlayer, the first metal layer, or the second metal layer.

The plurality of touch electrodes may include a driving electrodeextending in a first direction, and a sensing electrode extending in asecond direction crossing the first direction, wherein the touch lineincludes a driving line connected to a first end of the drivingelectrode, and a sensing line connected to a first end of the sensingelectrode.

The plurality of switching; elements may include: a first switchingtransistor connected to a second end of the driving electrode; and asecond switching transistor connected to a second end of the sensingelectrode.

The common voltage line may include a first common voltage line and asecond common voltage line, wherein the plurality of switching elementsinclude: a first switching transistor connected between the first commonvoltage line and the second end of the driving electrode; and a secondswitching transistor connected between the second common voltage lineand the second end of the sensing electrode.

The display device may further include: a first electromagnetic controlline connected to a gate electrode of each of the plurality of firstswitching transistors; and a second electromagnetic control lineconnected to a gate electrode of each of the plurality of secondswitching transistors, wherein the first electromagnetic control linesupplies a first control signal of a gate-on level to the plurality offirst switching transistors during a first period, and the secondelectromagnetic control line supplies a second control signal of agate-on level to the plurality of second switching transistors during, asecond period, after the first period.

The display device may further include: a first extension line connectedto the second end of the driving electrode; and a second extension lineconnected to the second end of the sensing electrode, wherein theplurality of switching elements include: a first switching transistorconnected between the first extension line and the common voltage line;and a second switching transistor connected between the second extensionline and the common voltage line.

The display device may further include: a first extension line connectedto the second end of the driving electrode; and a second extension lineconnected to the second end of the sensing electrode, wherein theplurality of switching elements include: a first demultiplexer forconnecting the first extension line to the common voltage line or thedriving line; and a second demultiplexer for connecting the secondextension line to the common voltage line or the sensing line.

According to an embodiment of the present disclosure, a display deviceincludes: a display unit having a plurality of pixels; a plurality oftouch electrodes disposed on the display unit; a touch line connected toa first end of each of the plurality of touch electrodes; a commonvoltage line spaced apart from the plurality of touch electrodes; and aplurality of coupling capacitors connected between the common voltageline and a second end of each of the plurality of touch electrodes.

The display device may further include a touch driver configured tosense an input of a user's body by driving the plurality of touchelectrodes during a first period, and to sense an input of an inputmember by driving the plurality of touch electrodes during a secondperiod different from the first period.

The display unit may include: a substrate; a thin film transistor layerdisposed on the substrate and comprising a plurality of thin filmtransistors; and a light emitting element layer disposed on the thinfilm transistor layer and including a plurality of light emittingelements, wherein the plurality of light emitting elements include: aplurality of pixel electrodes respectively corresponding to a pluralityof emission areas; a light emitting layer disposed on the plurality ofpixel electrodes; and a common electrode disposed on the light emittinglayer and common to the plurality of emission areas.

Each of the plurality of coupling capacitors may include: a firstcapacitor electrode connected to the second end of each of the pluralityof touch electrodes; and a second capacitor electrode, wherein thesecond capacitor electrode is a pan of the common voltage lineintegrally formed with the common electrode.

The plurality of touch electrodes may include: a driving electrodeextending in a first direction in a first metal layer; a sensingelectrode extending in a second direction crossing the first directionin the first metal layer; and a bridge electrode connecting the drivingelectrode in a second metal layer different from the first metal layer,wherein each of the plurality of coupling capacitors includes; a firstcapacitor electrode disposed on the second metal layer and connected tothe second end of each of the plurality of touch electrodes; and asecond capacitor electrode disposed on the first metal layer andconnected to the common voltage line.

The plurality of touch electrodes may include: a driving electrodeextending in a first direction in a first metal layer; a sensingelectrode extending in a second direction crossing the first directionin the first metal layer; and a bridge electrode connecting the drivingelectrode in a second metal layer different from the first metal layer,wherein each of the plurality of coupling capacitors includes: a firstcapacitor electrode disposed on the second metal layer and connected tothe second end of each of the plurality of touch electrodes; and asecond capacitor electrode disposed on the first metal layer, whereinthe second capacitor electrode is a part of the common voltage line.

The plurality of touch electrodes may include a driving electrodeextending in a first direction, and a sensing electrode extending in asecond direction crossing the first direction, wherein the touch lineincludes a driving line connected to a first end of the drivingelectrode, and a sensing line connected to a first end of the sensingelectrode.

The plurality of coupling capacitors may include: a first couplingcapacitor connected between the common voltage line and a second end ofthe driving electrode; and a second coupling capacitor connected betweenthe common voltage line and a second end of the sensing electrode.

The common voltage line may include a first common voltage line, asecond common voltage line, a third common voltage line, and a fourthcommon voltage line, wherein the plurality of coupling capacitorsinclude: a first coupling capacitor connected between a second end ofthe driving electrode and the first or second common voltage line; and asecond coupling capacitor connected between a second end of the sensingelectrode and the third or fourth common voltage line.

The common voltage line may include a first common voltage line, asecond common voltage line, a third common voltage line, and a fourthcommon voltage line, wherein the plurality of coupling capacitorsinclude: a first-first coupling capacitor connected between the firstcommon voltage line and a second end of the driving electrode; afirst-second coupling capacitor connected between the second commonvoltage line and an end of the first-first coupling capacitor: asecond-first coupling capacitor connected between the third commonvoltage line and a second end of the sensing electrode; and asecond-second coupling capacitor connected between an end of thesecond-first coupling capacitor and the fourth common voltage line.

The common voltage line may include a first common voltage line and asecond common voltage line, wherein the plurality of coupling capacitorsinclude: a first coupling. capacitor connected between the first commonvoltage line and a second end of the driving electrode; and a secondcoupling capacitor connected between the second common voltage line anda second end of the sensing electrode.

The display device may further include a touch driver configured tosupply a first driving signal having a first phase to the plurality ofdriving electrodes during a first period, and supply a first commonvoltage having the first phase to the first common voltage line duringthe first period, the touch driver is configured to supply a seconddriving signal having the first phase to the plurality of sensingelectrodes during a second period after the first period, and supply asecond common voltage having a second phase opposite to the first phaseto the second common voltage line during the second period.

The common voltage line may include a first common voltage line, asecond common voltage line, a third common voltage line, and a fourthcommon voltage line, wherein the plurality of coupling capacitors mayinclude: a plurality of first coupling capacitors alternately connectedto the first or second common voltage line; and a plurality of secondcoupling capacitors alternately connected to the third or fourth commonvoltage line.

The display device may further include a touch driver configured tosupply a first driving signal having a first phase to the plurality ofdriving electrodes during a first period, and to supply first and secondcommon voltages having the first phase to the first and second commonvoltage lines during the first period, wherein the touch driver isconfigured to supply a second-first driving signal having the firstphase to a first portion of the plurality of sensing electrodes during asecond period after the first period, and supply a third common voltagehaving a second phase opposite to the first phase to the third commonvoltage line during the second period, and the touch driver isconfigured to supply a second-second driving signal having the secondphase to a second portion of the plurality of sensing electrodes duringthe second period, and to supply a fourth common voltage having thefirst phase to the fourth common voltage line during the second period.

According to an embodiment of the present disclosure, a sensing systemincludes: a display device for displaying an image; and wherein thedisplay device includes: a display unit having a plurality of pixels; aplurality of touch electrodes disposed on the display unit; a touch lineconnected to a first end of each of the plurality of touch electrodes; acommon voltage line disposed away from the plurality of touchelectrodes; a plurality of switching elements connected between thecommon voltage line and a second end of each of the plurality of touchelectrodes; and a touch driver configured to sense an input of a user'sbody by driving the plurality of touch electrodes during a first period,and to sense an input of an input member by driving the plurality oftouch electrodes during a second period different from the first period.

The touch driver may supply a first driving signal having a first phaseto at least one touch electrode disposed on a first side of a pointamong the plurality of touch electrodes, and may supply a second drivingsignal having a second phase opposite to the first phase to at least onetouch electrode disposed on a second side of the point among theplurality of touch electrodes, and the touch driver may receive a firstsensing signal having the first phase from at least one touch electrodedisposed on the first side of the point, and may receive a secondsensing signal having the second phase from at least one touch electrodedisposed on the second side of the point.

The input member may be charged by an electromagnetic resonance methodwhen the first and second driving signals are disposed on the pointduring a second-first period in which the first and second drivingsignals are supplied to the plurality of touch electrodes, the inputmember may be discharged when a supply of the first and second drivingsignals is stopped during a second-second period immediately after thesecond-first period, and the touch driver may receive a first sensingsignal having the first phase from at least one touch electrode disposedon the first side of the point during the second-second period, and mayreceive a second sensing signal having the second phase from at leastone touch electrode disposed on the second side of the point.

According to embodiments of the present disclosure, in the displaydevice and a sensing system including the same, a touch line may supplya driving signal to a first end of touch electrodes, and a commonvoltage line may supply a common voltage to a second end of the touchelectrodes, which is farthest from the touch line, so that the potentialof the second end of the touch electrodes may be stably maintained. Thecommon voltage line may supply a common voltage to the second end of thetouch electrodes, so that sensing sensitivity at the second end of thetouch electrodes may be improved. Accordingly, the display device andthe sensing system including the same may include a switching elementand the common voltage line disposed in a touch peripheral area, so thatthe reliability of the sensor may be secured over the entire area of thetouch sensor area.

According to embodiments of the present disclosure, in the displaydevice and, the sensing system including the same, the touch line maysupply a driving signal to a first end of the touch electrodes, and thecoupling capacitor may be connected between a second end of the touchelectrodes, which is farthest from the touch line and the common voltageline, so that the potential of the second end of the touch electrodesmay be stably maintained. The coupling, capacitor may improve sensingsensitivity at the second end of the touch electrodes. Accordingly, thedisplay device and the sensing system including the same may include thecoupling capacitor and the common voltage line disposed in the touchperipheral area, so that the reliability of the sensor may be securedover the entire area of the touch sensor area.

According to embodiments of the present disclosure, in the displaydevice and the sensing system including the same, the touch of the inputmember may be sensed using the touch sensing unit that senses the touchof the user's body. Accordingly, the display device and the sensingsystem including the same do not include a separate sensor layer or adigitizer layer for the electromagnetic resonance of the touch inputmember, thereby reducing the thickness of the display device andreducing cost.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features of the present disclosure will become moreapparent by describing in detail embodiments thereof with reference tothe attached drawings, in which:

FIG. 1 is a perspective view showing a display device according to anembodiment of the present disclosure;

FIG. 2 is a cross-sectional view illustrating a display device accordingan one embodiment of the present disclosure;

FIG. 3 is a cross-sectional view showing a display device according ananother embodiment of the present disclosure;

FIG. 4 is a plan view illustrating a display unit of a display deviceaccording to an embodiment of the present disclosure;

FIG. 5 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure;

FIG. 6 is an enlarged view of area A1 of FIG. 5 ;

FIG. 7 is an enlarged view illustrating a part of a display deviceaccording to an embodiment of the present disclosure;

FIG. 8 is a cross-sectional view taken along line I-I′ of FIG. 7 ;

FIG. 9 is a cross-sectional view illustrating a display area and anon-display area in a display device according to an embodiment of thepresent disclosure;

FIG. 10 is a view illustrating a sensing driving process and thecharging of an input member in a sensing system according to anembodiment of the present disclosure;

FIG. 11 is a view illustrating the discharging of an input member andthe input sensing process in the sensing system according to anembodiment of the present disclosure;

FIG. 12 is a waveform diagram illustrating a plurality of first drivingsignals, a plurality of second driving signals, a control signal, anelectromotive force of an input member, and a differential sensingsignal in a sensing system according to an embodiment of the presentdisclosure;

FIG. 13 is a timing diagram illustrating the operation of a displaydriver and a touch driver in a display device according to an embodimentof the present disclosure;

FIG. 14 is a graph illustrating the sensing sensitivity of a sensingsystem according to an embodiment of the present disclosure;

FIG. 15 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure;

FIG. 16 is a waveform diagram illustrating a plurality of first drivingsignals, a plurality of second driving signals, a first control signal,a second control signal, an electromotive force of an input member, anda differential sensing signal in a sensing system according to anembodiment of the present disclosure;

FIG. 17 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure;

FIG. 18 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure;

FIG. 19 is a circuit diagram illustrating an example of a firstdemultiplexer in the display device of FIG. 18 ;

FIG. 20 is a circuit diagram illustrating an example of a firstdemultiplexer in the display device of FIG. 18 ;

FIG. 21 is a circuit diagram illustrating an example of a Frigdemultiplexer in the display device of FIG. 18 ;

FIG. 22 is a plan view illustrating a touch sensing unit, a circuitboard, and a touch driver of a display device according to an embodimentof the present disclosure;

FIG. 23 is a plan view illustrating a touch sensing unit, a circuitboard, a touch driving circuit, and an electromagnetic driving circuitof a display device according to another embodiment;

FIG. 24 is a plan view illustrating a touch sensing unit, a circuitboard, a touch driving circuit, and an electromagnetic driving circuitof a display device according, to an embodiment of the presentdisclosure;

FIG. 25 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure;

FIG. 26 is a plan view illustrating an example of a touch sensing unitof the display device of FIG. 25 ;

FIG. 27 is a cross-sectional view taken along line of II-II′ FIG. 26 ;

FIG. 28 is a plan view illustrating an example of a touch sensing unitof the display device of FIG. 25 ;

FIG. 29 is a cross-sectional view taken along line III-III′ of FIG. 28 ;

FIG. 30 is a plan view illustrating an example of a touch sensing unitof the display device of FIG. 25 ;

FIG. 31 is a graph illustrating sensing sensitivity of a sensing systemaccording to an embodiment of the present disclosure;

FIG. 32 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure;

FIG. 33 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure;

FIG. 34 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure;

FIG. 35 is a waveform diagram illustrating a signal applied to the touchsensing unit of FIG. 34 ;

FIG. 36 is a plan view illustrating a touch Sensing unit of a displaydevice according to an embodiment of the present disclosure; and

FIG. 37 is a waveform diagram illustrating a signal applied to the touchsensing unit of FIG. 36 .

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the following description, for the purposes of explanation, numerousspecific details are set forth to provide a thorough understanding ofvarious embodiments or implementations of the disclosure. As used herein“embodiments” and “implementations” are interchangeable words that arenon-limiting examples of devices or methods employing one or more of theinventions of disclosures set forth herein. It is apparent, however,that various embodiments may be practiced without these specific detailsor with one or more equivalent arrangements. In other instances,well-known structures and devices are shown in block diagram form toavoid unnecessarily obscuring various embodiments. Further, variousembodiments may be different, but do not have to be exclusive. Forexample, specific shapes, configurations, and characteristics of anembodiment may be used or implemented in other embodiments.

Unless otherwise specified, the illustrated embodiments are to beunderstood as providing features of varying detail of some ways in whichthe disclosure may be implemented in practice. Therefore, unlessotherwise specified, the features, components, modules, layers, films,panels, regions, and/or aspects, etc. (hereinafter individually orcollectively referred to as “elements”), of the various embodiments maybe otherwise combined, separated, interchanged, and/or rearranged,

The use of cross-hatching and/or shading in the accompanying drawings isgenerally provided to clarify boundaries between adjacent elements. Assuch, neither the presence nor the absence of cross-hatching or shadingconveys or indicates any preference or requirement for particularmaterials, material properties, dimensions, proportions, commonalitiesbetween illustrated elements, and/or any other characteristic,attribute, property, etc., of the elements, unless specified.

Further, in the accompanying drawings, the size and relative sizes ofelements may be exaggerated for clarity and/or descriptive purposes.When an embodiment may be implemented differently, a specific processorder may be performed differently from the described order. Forexample, two consecutively described processes may be performedsubstantially at the same time or performed in an order opposite to thedescribed order. In addition, like reference numerals may denote likeelements.

When an element, such as a layer, is referred to as being “on,”“connected to,” or “coupled to” another element or layer, it may bedirectly on, connected to, or coupled to the other element or layer orintervening elements or layers may be present. When, however, an elementor layer is referred to as being “directly on,” “directly connected to,”or “directly coupled to” another element or layer, there are nointervening elements or layers present. The term “connected” may referto physical, electrical, and/or fluid connection, with or withoutintervening elements.

Further, the X-axis, the Y-axis, and the Z-axis are not limited to threeaxes of a rectangular coordinate system, and thus the. X-, Y-, andZ-axes, and may be interpreted, in a broader sense. For example, theX-axis, the Y-axis, and the Z-axis may be perpendicular to one another,or may represent different directions that are not perpendicular to oneanother.

For the purposes of this disclosure, “at least one of X, Y, and Z” and“at least one selected from the group consisting of X, Y, and Z” may beconstrued as X only, Y only, Z only, or any combination of two or moreof X, Y, and Z, such as, for instance, XYZ, XYY, YZ, and ZZ. As usedherein, the term “and/or” includes any and all combinations of one ormore of the associated listed items.

Although the terms “first,” “second,” and the like may be used herein todescribe various types of elements, these elements should not be limitedby these terms. These terms are used to distinguish one element fromanother element. Thus, a first element discussed below could be termed asecond element.

Spatially relative terms, such as “beneath,” “below,” “under,” “lower,”“above,” “'upper,” “over,” “higher,” “side” (e.g., as in “sidewall”),and the like, may be used herein for descriptive purposes, and, thereby,to describe one elements relationship to another element(s) asillustrated in the drawings. Spatially relative terms are intended toencompass different orientations of an apparatus in use, operation,and/or manufacture in addition to the orientation depicted in thedrawings. For example, if the apparatus in the drawings is turned over,elements described as “below” or “beneath” other elements or featureswould then be oriented “above” the other elements or features. Thus, theterm “below” can encompass both an orientation of above and below.Furthermore, the apparatus may be otherwise oriented (e.g., rotated 90degrees or at other orientations), and, as such, the spatially relativedescriptors used herein should be interpreted accordingly.

The terminology used herein is for the purpose of describing particularembodiments and is not intended to be limiting. As used herein, thesingular forms, “a,” “an,” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise, Moreover,the terms “comprises,” “comprising,” “includes,” and/or “including,”when used in this specification, specify the presence of statedfeatures, integers, steps, operations, elements, components, and/orgroups thereof but do not preclude the presence or addition of one ormore other features, integers, steps, operations, elements, components,and/or groups thereof. It is also noted that, as used herein, the terms“substantially,” “about,” and other similar terms, are used as terms ofapproximation, not as terms of degree, and thus are utilized to accountfor inherent deviations in measured, calculated, and/or provided valuesthat would be recognized by one of ordinary skill in the art.

Various embodiments are described herein with reference to sectionaland/or exploded illustrations that are schematic illustrations ofidealized embodiments and/or intermediate structures. As such,variations from the shapes of the illustrations as a result, forexample, of manufacturing techniques and/or tolerances, are to beexpected. Thus, embodiments disclosed herein should not necessarily beconstrued as limited to the particular illustrated shapes of regions,but are to include deviations in shapes that result from, for instance,manufacturing. In this manner, regions illustrated in the drawings maybe schematic in nature, and the shapes of these regions may not reflectactual shapes of regions of a device and are not necessarily intended tobe limiting.

As customary in the field, some embodiments are described andillustrated in the accompanying drawings in terms of functional blocks,units, parts, and/or modules. Those skilled in the art will appreciatethat these blocks, units, parts, and/or modules are physicallyimplemented by electronic (or optical) circuits, such as logic circuits,discrete components, microprocessors, hard-wired circuits, memoryelements, wiring connections, and the like, which may be formed usingsemiconductor-based fabrication techniques or other manufacturingtechnologies. In the case of the blocks, units, parts, and or modulesbeing implemented by microprocessors or other similar hardware, they maybe programmed and controlled using software (e.g., microcode) to performvarious functions discussed herein and may optionally be driven byfirmware and/or software. It is also contemplated that each block, unit,part, and/or module may be implemented by dedicated hardware, or as acombination of dedicated hardware to perform some functions and aprocessor (e.g., one or more programmed microprocessors and associatedcircuitry) to perform other functions. In addition, each block, unit,part, and/or-module of some embodiments may be physically separated intotwo or more interacting and discrete blocks, units, parts, and/ormodules. Further, the blocks, units, parts, and/or modules of someembodiments may be physically combined into more complex blocks, units,parts, and/or modules.

Unless otherwise defined or implied herein, all terms (includingtechnical and scientific terms) used herein have the same meaning ascommonly understood by one of ordinary skill in the art to which thisdisclosure pertains. It will be further understood that terms, such asthose defined in commonly used dictionaries, should be interpreted ashaving a meaning that is consistent with their meaning in the context ofthe relevant art and the disclosure, and should not be interpreted in anideal or overly formal sense, unless clearly so defined herein.

FIG. 1 is a perspective view showing a display device according to anembodiment of the present disclosure.

Referring to FIG. 1 , a display device 10 may be applied to portableelectronic devices such as a mobile phone, a smartphone, a tabletpersonal computer (PC′), a mobile communication terminal, an electronicorganizer, an electronic book, a portable multimedia player (PMP), anavigation system, an ultra mobile PC (UMPC) or the like. For example,the display device 10 may be applied as a display unit of a television,a laptop, a monitor, a billboard, or an Internet-of-Things (IoT) device,As another example, the display device 10 may be applied to wearabledevices such as a smart watch, a watch phone, a glasses type display, ora head mounted display (HMD). As yet another example, the display device10 may be applied to a dashboard of a vehicle, a center fascia of avehicle, a center information display (CID) disposed on a dashboard of avehicle, a room mirror display in place of side mirrors of a vehicle, ora display disposed on a rear surface of a front seat for rear seatentertainment of a vehicle.

The display device 10 may have a planar shape similar to a quadrilateralshape. For example, the display device 10 may have a shape similar to aquadrilateral shape, in a plan view, having short sides in an X-axisdirection and long sides in a Y-axis direction. The corner where theshort side in the X-axis direction and the long side in the Y-axisdirection meet may be rounded to have a predetermined curvature or maybe right-angled. The planar shape of the display device 10 is notlimited to a quadrilateral shape, and may be in a shape similar toanother polygonal shape, a circular shape, or elliptical shape.

The display device 10 may include the display panel 100, the displaydriver 200, the circuit board 300, and the touch driver 400.

The display panel 100 may include a main region MA and a sub-region SBA.

The main region MA may include the display area DA including pixels fordisplaying an image and the non-display area NDA disposed around thedisplay area DA. The display area DA may emit light from a plurality ofemission areas or a plurality of opening areas. For example, the displaypanel 100 may include a pixel circuit including switching elements, apixel defining layer for defining an emission area or an opening area,and a self-light emitting element.

For example, the self-light emitting element may include at least one ofan organic light emitting diode including an organic light emittinglayer, a quantum dot light emitting diode including a quantum dot lightemitting layer, an inorganic light emitting diode including an inorganicsemiconductor, or a micro light emitting diode (micro LED), but is notlimited thereto.

The non-display area NDA may be an area outside the display area DA. Thenon-display area NDA may be an edge area of the main region MA of thedisplay panel 100. The non-display area NDA may include a gate driverthat supplies gate signals to gate lines, and fan-out lines that connectthe display driver 200 to the display area DA.

The sub-region SBA may extend from one side of the main region MA. Thesub-region SBA may include a flexible material which can be bent, foldedor rolled, For example, when the sub region SBA is bent, the sub-regionSBA may overlap the main region MA in a thickness direction (Z-axisdirection). The sub-region SBA may include a display driver 200 and apad unit connected to the circuit board 300. Optionally, the sub-regionSBA may be omitted, and the display driver 200 and the pad unit may bearranged in the non-display area NDA.

The display driver 200 may output signals and voltages for driving thedisplay panel 100. The display driver 200 may supply a data voltage to adata line. The display driver 200 may supply a power voltage to thepower line and may supply a gate control signal to the gate driver. Thedisplay driver 200 may be an integrated circuit (IC) and mounted on thedisplay panel 100 by a chip on glass (COG) method, a chip on plastic(COP) method, or an ultrasonic bonding, method. For example, the displaydriver 200 may be disposed in the sub-region SBA, and may overlap themain region MA in the thickness direction (Z-axis direction) by bendingof the sub-region SBA. For another example, the display driver 200 maybe mounted on the circuit board 300.

The circuit board 300 may be attached to the pad unit of the displaypanel 100 by using an anisotropic conductive film (ACF). Lead lines ofthe circuit board 300 may be electrically connected to the pad unit ofthe display panel 100. The circuit board 300 may be a flexible printedcircuit board, a printed circuit board, or a flexible film such as achip on film.

The touch driver 400 may be mounted on the circuit board 300. The touchdriver 400 may be connected to a touch sensing unit of the display panel100. The touch driver 400 may supply a driving signal to a plurality oftouch electrodes of the touch sensing unit and may sense an amount ofchange in capacitance between the plurality of touch electrodes. Forexample, the driving signal may be a pulse signal having a predeterminedfrequency. The touch driver 400 may calculate whether an input is madeand input coordinates corresponding to where the input is made based onan amount of change in capacitance between the plurality of touchelectrodes. The touch driver 400 may be an integrated circuit (IC).

FIG. 2 is a cross-sectional view illustrating a display device accordingto an embodiment of the present disclosure.

Referring to FIG. 2 , the display panel 100 may include a display unitDU and a touch sensing unit TSU. The display unit DU may include asubstrate SUB, a thin film transistor layer TFTL, a light emittingelement layer EML, and an encapsulation layer TFEL.

The substrate SUB may be a base substrate or a base member. Thesubstrate SUB may be a flexible substrate which can be bent, folded orrolled. For example, the substrate SUB may include an insulatingmaterial such as a polymer resin such as polyimide (PI), but the presentdisclosure is not limited thereto. As another example, the SUB mayinclude a glass material or a metal material.

The thin film transistor layer TFTL may be disposed on the substrateSUB. The thin film transistor layer TFTL may include a plurality of thinfilm transistors constituting a pixel circuit of pixels. The thin filmtransistor layer TFTL may further include gate lines, data lines, powerlines, gate control lines, fan-out lines that connect the display driver200 to the data lines, lead lines that connect the display driver 200 tothe pad unit, and the like. Each of the thin film transistors mayinclude a semiconductor region, a drain electrode, a source electrode,and a gate electrode. For example, when the gate driver is formed on oneside of the non-display area NDA of the display panel 100, the gatedriver ma include thin film transistors.

The thin film transistor layer TFTL may be disposed in the display areaDA, the non-display area NDA, and the sub-region SBA. Thin filmtransistors, gate lines, data lines, and power lines of each of thepixels of the thin film transistor layer TFTL may be disposed in thedisplay area DA. Gate control lines and fan-out lines of the thin filmtransistor layer TFTL may be disposed in the non-display area NDA. Thelead lines of the thin film transistor layer TFTL may be disposed in thesub-region SBA.

The light emitting element layer EML may be disposed on the thin filmtransistor layer TFTL. The light emitting element layer EML may includea plurality of light emitting elements in which a first electrode, alight emitting layer, and a second electrode are sequentially stacked toemit light, and a pixel defining layer for defining pixels. A pluralityof light emitting elements of the light emitting element layer EML maybe disposed in the display area DA. The light emitting element layer EMLmay not be disposed in the non-display area NDA.

For example, the light emitting element layer EML may be an organiclight emitting layer including an organic material. The light emittingelement layer EML may include a hole transporting layer, an organiclight emitting layer, and an electron transporting layer. When the firstelectrode receives a predetermined voltage through the thin filmtransistor of the thin film transistor layer TFTL and the secondelectrode receives the common voltage, holes and electrons may betransferred to the organic light emitting layer through the holetransporting layer and the electron transporting layer, respectively andmay be combined with each other to emit light in the organic lightemitting layer. For example, the first electrode may be an anodeelectrode, and the second electrode may be a cathode electrode, but thepresent disclosure is not limited thereto.

As another example, the plurality of light emitting elements may includea quantum dot light emitting diode including a quantum dot lightemitting layer, an inorganic light emitting diode including an inorganicsemiconductor, or an ultra-small light emitting diode.

The encapsulation layer TFEL may cover the top surface and the sidesurface of the light emitting element layer EML, and may protect thelight emitting element layer EML. The encapsulation layer TFEL mayinclude at least one inorganic layer and at least one organic layer forencapsulating the light emitting element layer EML.

The touch sensing unit TSU may be disposed on the encapsulation layerTFEL. The touch sensing unit TSU may include a plurality of touchelectrodes for sensing a user's touch in a capacitive manner, and touchlines for connecting the plurality of touch electrodes to the touchdriver 400. The touch electrode may include a driving electrode and asensing electrode, and the touch line may include a driving lineconnected to the driving electrode and a sensing line connected to thesensing electrode. The touch sensing unit TSU may sense a touch of auser's body by using a mutual capacitance or self-capacitance method.For example, the touch driver 400 may supply a driving signal to aplurality of driving electrodes and receive a sensing signal from aplurality of sensing electrodes to sense an amount of change in mutualcapacitance between the driving electrode and the sensing electrode. Asanother example, the touch driver 400 may supply a driving signal toeach of the plurality of driving electrodes and the plurality of sensingelectrodes, and receive a sensing signal from each of the plurality ofdriving electrodes and the plurality of sensing electrodes, therebysensing an amount of change in self-capacitance of each of the pluralityof driving electrodes and the plurality of sensing electrodes.

As another example, the touch sensing unit TSU may sense the approach orcontact of an input member such as an input pen. Here, the input pen maybe a stylus pen, an electromagnetic pen, a smart pen, or an active pen,but the present disclosure is not limited thereto. For example, thestylus pen may include a coil, and may output a radio frequency signalin response to a magnetic field or electromagnetic signal.

The plurality of touch electrodes of the touch sensing unit TSU may bedisposed in a touch sensor area overlapping the display area DA. Thetouch lines of the touch sensing unit TSU may be disposed in a touchperipheral area that overlaps the non-display area NDA.

For example, a polarizing film and a cover window may be additionallydisposed on the touch sensing unit TSU. The polarizing film may bedisposed on the touch sensing unit TSU, and the cover window may bedisposed on the polarizing film by an adhesive member.

The sub-region SBA of the display panel 100 may extend from one side ofthe main region MA. The sub-region SBA may include a flexible materialwhich can be bent, folded or rolled. For example, when the sub-regionSBA is bent, the sub-region SBA may overlap the main region MA in athickness direction (Z-axis direction). In other words, the sub-regionSBA may be disposed below the display area DA. The sub-region SBA mayinclude the display driver 200 and the pad unit connected to the circuitboard 300.

FIG. 3 is a cross-sectional view showing a display device according toan embodiment of the present disclosure. The display device illustratedin FIG. 3 is different from the display device illustrated in FIG. 2 inthe configuration of the touch sensing unit. A description of the sameconfiguration as the above-described configuration will be briefly givenor omitted.

Referring to FIG. 3 , the display panel 100 may include the display unitDU and the touch sensing unit TSU. The display unit DU may include afirst substrate SUB1, the thin film transistor layer TFTL, the lightemitting element layer EML, and the encapsulation layer TFEL.

The first substrate SUB1 may be a base substrate or a base member. Forexample, the first substrate SUB1 may include an insulating materialsuch as a polymer resin such as polyimide (PI), but the presentdisclosure is not limited thereto.

The thin film transistor layer TFTL, the light emitting element layerEML, and the encapsulation layer TFEL may be sequentially stacked on thefirst substrate SUB1.

The touch sensing unit TSU may include a second substrate SUB2 and atouch sensor layer TSL. For example, the touch sensing unit TSU may beseparately fabricated and attached to the display unit DU, but is notlimited thereto.

The second substrate SUB2 may be disposed on the encapsulation layerTFEL. The second substrate SUB2 may be a base substrate or a basemember, and may support the touch sensing unit TSU. The second substrateSUB2 may be disposed between the touch sensing layer TSL and theencapsulation layer TFEL. For example, the second substrate SUB2 mayinclude a glass material or a metal material, but is not limitedthereto. As another example, the second substrate SUB2 may include aninsulating material such as a polymer resin such as polyimide (PI).

The touch sensor layer TSL may be disposed on the second substrate SUB2.The touch sensor layer TSL may include a plurality of touch electrodesfor sensing a user's touch in a capacitive manner, and touch lines forconnecting the plurality of touch electrodes to the touch driver 400.For example, the touch sensor layer TSL may sense the user's touch byusing a mutual capacitance method or a self-capacitance method. Asanother example, the touch sensing unit TSU may detect an approach orcontact of an input member such as an input pen. Here, the input pen maybe a stylus pen, an electromagnetic pen, a smart pen, or an active pen,but is not limited thereto.

FIG. 4 is a plan view illustrating a display unit of a display deviceaccording to an embodiment of the present disclosure.

Referring to FIG. 4 , the display unit DU may include the display areaDA and the non-display area NDA.

The display area DA, which is an area for displaying an image, may bethe central area of the display panel 100. The display area DA mayinclude a plurality of pixels SP, a plurality of gate lines GL, aplurality of data lines DL, and a plurality of power lines VL. Each ofthe plurality of pixels SP may be an area of the smallest unit thatoutputs light.

The plurality of gate lines GL may supply gate signals received from agate driver 210 to the plurality of pixels SP. The plurality of gatelines GL may extend in the X-axis direction and may be spaced apart fromeach other in the Y-axis direction that crosses the X-axis direction.

The plurality of data lines DL may supply a data, voltages received fromthe display driver 200 to the plurality of pixels SP. The plurality ofdata lines DL may extend in the Y-axis direction and may be spaced apartfrom each other in the X-axis direction.

The plurality of power lines VL may supply a power voltage received fromthe display driver 200 to the plurality of pixels SP. Here, the powervoltage may be at least one of a driving voltage, an initializationvoltage, a reference voltage, or a low potential voltage. The pluralityof power lines VL may extend in the Y-axis direction and may be spacedapart from each other in the X-axis direction.

The non-display area NDA may surround the display area DA. Thenon-display area NDA may include the gate driver 210, fan-out lines FOL,and a gate control line GCL. The gate driver 210 may generate aplurality of gate signals based on the gate control signal, and maysequentially supply the plurality of gate signals to the plurality ofgate lines GL according to a set order.

The fan-out lines FOL, may extend from the display driver 200 to thedisplay area DA. The fan-out lines FOL may supply the data voltagereceived from the display driver 200 to the plurality of data lines DL.

The gate control line GCL may extend from the display driver 200 to thegate driver 210. The gate control line GCL may supply the gate controlsignal received from the display driver 200 to the gate driver 210.

The sub-region SBA may include the display driver 200, a display padarea DPA, and first and second touch pad areas TPA1 and TPA2.

The display driver 200 may output signals and voltages for driving thedisplay panel 100 to the fan-out lines FOL. The display driver 200 maysupply a data voltage to the data line DL through the fan-out lines FOL.The data voltage may be supplied to the plurality of pixels SP todetermine the luminance of the plurality of pixels SP. The displaydriver 200 may supply the gate control signal to the gate driver 210through the gate control line GCL.

The display pad area DPA, the first touch pad area TPA1, and the secondtouch pad area TPA2 may be disposed at the edge of the sub-region SBA.The display pad area DPA, the first touch pad area TPA1, and the secondtouch pad area TPA2 may be electrically connected to the circuit board300 by using a low-resistance high-reliability material such as ananisotropic conductive film, or self assembly anisotropic conductivepaste (SAP).

The display pad area DPA may include a plurality of display pad unitsDP. The plurality of display pad units DP may be connected to a mainprocessor through the circuit board 300. The plurality of display padunits DP may be connected to the circuit board 300 to receive digitalvideo data, and may supply the digital video data to the display driver200.

FIG. 5 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure.

Referring to FIG. 5 , the touch sensing unit TSU may include a touchsensor area TSA for sensing a user's touch, and a touch peripheral areaTOA disposed around the touch sensor area TSA. The touch sensor area TSAmay overlap the display area DA of the display unit DU, and the touchperipheral area TOA may overlap the non-display area NDA of the displayunit DU.

The touch sensor area TSA may include a plurality of touch electrodesSEN and a plurality of dummy electrodes DME. The plurality of touchelectrodes SEN may form mutual capacitance or self-capacitance to sensea touch of an object or a person. The plurality of touch electrodes SENmay include a plurality of driving electrodes TE and a plurality ofsensing electrodes RE.

The plurality of driving electrodes TE may be spaced apart from eachother in the X-axis direction and the Y-axis direction. The drivingelectrodes TE adjacent in the Y-axis direction may be electricallyconnected through a bridge electrode CE. The plurality of drivingelectrodes TE may be connected to a first touch pad unit TP1 through adriving line TL. The plurality of driving electrodes TE and theplurality of bridge electrodes CE connected to one driving line TL mayextend in the Y-axis direction. For example, the driving, electrodes TEdisposed below the touch sensor area TSA may be connected to the firsttouch pad unit TP1 through the driving line TL. The driving line TL mayextend to the first touch pad unit. TP1 through the lower side of thetouch peripheral area TOA. The first touch pad unit TP1 may be connectedto the touch driver 400 through the circuit board 300.

The touch sensor area TSA may further include the bridge electrode CEconnecting the driving electrodes TE. The bridge electrode CE may bebent at least once. For example, the bridge electrode CE may have anangle bracket shape (“<” or “>”), but the planar shape of the bridgeelectrode CE is not limited thereto. The driving electrodes TE adjacentto each other in the Y-axis direction may be connected by a plurality ofbridge electrodes CE, and in the case one of the bridge electrodes CE isdisconnected, the driving electrodes TE may be stably connected throughthe remaining bridge electrode CE. The driving electrodes TE adjacent toeach other may be connected by two bridge electrodes CE, but the numberof bridge electrodes CE is not limited thereto.

The bridge electrode CE may be disposed on a different layer from theplurality of driving electrodes TE and the plurality of sensingelectrodes RE. The sensing electrodes RE adjacent to each other in theX-axis direction may be electrically connected through a connectionportion disposed on the same layer as the plurality of drivingelectrodes TE or the plurality of sensing electrodes RE, and the drivingelectrodes TE adjacent in the Y-axis direction may be electricallyconnected through the bridge electrode CE disposed on a different layerfrom the plurality of driving electrodes TE or the plurality of sensingelectrodes RE. Accordingly, although the bridge electrode CE overlapsthe plurality of sensing electrodes RE in the Z-axis direction, theplurality of driving electrodes TE and the plurality of sensingelectrodes RE may be insulated from each other. Mutual capacitance maybe formed between the driving electrode TE and the sensing electrode RE.

The plurality of sensing electrodes RE may extend in the X-axisdirection and may be spaced apart from each other in the Y-axisdirection. The sensing electrodes RE adjacent in the X-axis directionmay be electrically connected through a connection portion. Theconnection portion may be integrally formed between two adjacent sensingelectrodes RE.

The plurality of sensing electrodes RE may be connected to the secondtouch pad unit TP2 through a sensing line RL. For example, the sensingelectrodes RE disposed on the right side of the touch sensor area TSAmay be connected to a second touch pad unit TP2 through the sensing lineRL. The sensing line RL may extend to the second touch pad unit TP2through the right side and the lower side of the touch peripheral areaTOA. The second touch pad unit TP2 may be connected to the touch driver400 through the circuit board 300.

Each of the plurality of dummy electrodes DME may be surrounded by thedriving electrode TE or the sensing electrode RE. Each of the dummyelectrodes DME may be insulated by being spaced apart from the drivingelectrode TE or the sensing electrode RE. Accordingly, the dummyelectrode DME may be electrically floating. Optionally, the plurality ofdummy electrodes DME may be omitted.

The touch peripheral area TOA may, include the driving line TL, thesensing line RL, a plurality of switching transistors EMT, anelectromagnetic control line ECL, and a common voltage line VCL.

The switching transistor EMT may be a switching element connectedbetween the plurality of touch electrodes SEN and the common voltageline VCL. The plurality of switching transistors EMT may include a firstswitching transistor EMT1 and a second switching transistor EMT2. Thefirst switching transistor EMT1 may be disposed on the upper side of thetouch peripheral area TOA. The first switching transistor EMT1 may bedisposed on the opposite side of the driving line TL. The firstswitching transistor EMT1 may be connected to the driving electrodes TEdisposed farthest from the driving line TL. For example, the firstswitching transistor EMT1 may be disposed between the driving electrodeTE disposed farthest from the driving line TL and a side of the touchsensing unit TSU disposed farthest from the sub-region SBA. The firstswitching transistor EMT1 may be disposed between the driving electrodesTE and the common voltage line VCL disposed on the upper side of thetouch sensor area TSA. The first switching transistor EMT1 may be turnedon based on a control signal of the electromagnetic control line ECL.For example, the control signal of the electromagnetic control line ECLmay be provided to a gate electrode of the first switching transistorEMT1. The first switching transistor EMT1 may be turned off during thetouch sensing period, and the driving electrodes TE may not receive acommon voltage. The first switching transistor EMT1 may be turned onduring the electromagnetic sensing period to supply a common voltage tothe driving electrodes TE. Here, the touch driver 400 may sense a touchof the user's body during the touch sensing period, and sense theapproach or contact of an input member such as an input pen during theelectromagnetic sensing period.

The second switching transistor EMT2 may be disposed on the left side ofthe touch peripheral area TOA. The second switching transistor EMT2 maybe disposed on the opposite side of the sensing line RL. The secondswitching transistor EMT2 may be connected to the sensing electrodes REdisposed farthest from the sensing line RL. The second switchingtransistor EMT2 may be disposed between the sensing electrodes RE andthe common voltage line VCL disposed on the left side of the touchsensor area ISA. The second switching transistor EMT2 may be turned onbased on a control signal of the electromagnetic control line ECL. Forexample, the control signal of the electromagnetic control line ECL maybe provided to a gate electrode of the second switching transistor EMT2.The second switching transistor EMT2 may be turned off during the touchsensing period, and the sensing electrodes RE may not receive the commonvoltage. The second switching transistor EMT2 may be turned on duringthe electromagnetic sensing period to supply a common voltage to thesensing electrodes RE. In other words, the first and second switchingtransistors EMT1 and EMT2 may be on and off at the same time.

The electromagnetic control line ECL, may supply a control signal to thegate electrode of the plurality of switching transistors EMT. Theelectromagnetic control line ECL may extend to the first touch pad unitTP1 via the upper side, the left side, and the lower side of the touchperipheral area TOA. The electromagnetic control line ECL may supply agate-off level control signal to the plurality of switching transistorsEMT during the touch sensing period. The electromagnetic control lineECL may supply a control signal of a gate-on level to the plurality ofswitching transistors EMT during the electromagnetic sensing period.

The common voltage line VCL may be disposed along the periphery of thetouch peripheral area TOA. The common voltage line VCL may extend to thefirst touch pad unit TP1 via the upper side, the left side, and thelower side of the touch peripheral area TOA. The number of commonvoltage lines VCL is not limited to that illustrated in FIG. 5 . Thecommon voltage line VCL may supply a common voltage to the drivingelectrodes TE and the sensing electrodes RE during the electromagneticsensing period. For example, the common voltage of the common voltageline VCL may be the same as the common voltage supplied to the displayunit DU, but is not limited thereto. As another example, the commonvoltage of the common voltage line VCL may have a constant potential. Asanother example, the common voltage of the common voltage line VCL maybe a sine wave, a pulse wave, or a ramp wave having a predeterminedfrequency.

In the case that the sensing lines RL are disposed on the left side ofthe touch peripheral area TOA and the driving lines TL are disposed onthe right side of the touch peripheral area TOA, a portion of the commonvoltage line VCL and the second switching transistors EMT2 may bedisposed on the right side of the touch peripheral area TOA.

The display pad area DPA the first touch pad area TPA1, and the secondtouch pad area TPA2 may be disposed at the edge of the sub-region SBA.The display pad area DPA, the first touch pad area TPA1, and the secondtouch pad area TPA2 may be electrically connected to the circuit board300 by using a low-resistance high-reliability material such as ananisotropic conductive film or self assembly anisotropic conductivepaste (SAP).

The first touch pad area TPA1 may be disposed on one side of the displaypad area DPA, and may include a plurality of first touch pad units TP1.The plurality of first touch pad units TP1 may be electrically connectedto the touch driver 400 disposed on the circuit board 300. The pluralityof first touch pad units TP1 may supply a driving signal to theplurality of driving electrodes TE through a plurality of driving linesTL. The plurality of first touch pad units TP1 may supply a commonvoltage to the driving electrodes TE and the sensing electrodes REthrough the common voltage line VCL during the electromagnetic sensingperiod.

The second touch pad area TPA2 may be disposed on the other side of thedisplay pad area DPA, and may include a plurality of second touch padunits TP2. The plurality of second touch pad units TP2 may beelectrically connected to the touch driver 400 disposed on the circuitboard 300. The touch driver 400 may receive a sensing signal through aplurality of sensing lines RL connected to the plurality of second touchpad units TP2, and may sense a change in mutual capacitance between thedriving, electrode TE and the sensing electrode RE.

As another example, the touch driver 400 may supply a driving signal toeach of the plurality of driving electrodes TE and the plurality ofsensing electrodes RE, and may receive a sensing signal from each of theplurality of driving electrodes TE and the plurality of sensingelectrodes RE. The touch driver 400 may sense an amount of change inelectric charge of each of the plurality of driving electrodes TE andthe plurality of sensing electrodes RE based on the sensing signal.

FIG. 6 is an enlarged view of area A1 of FIG. 5 , and FIG. 7 is anenlarged view illustrating a part of a display device according to anembodiment of the present disclosure.

Referring to FIGS. 6 and 7 , the plurality of driving electrodes TE, theplurality of sensing electrodes RE, and the plurality of dummyelectrodes DME may be disposed on the same layer and may be spaced apartfrom each other.

The plurality of driving electrodes TE may be spaced apart from eachother in the X-axis direction and the Y-axis direction. The drivingelectrodes TE adjacent in the Y-axis direction may be electricallyconnected through a bridge electrode CE.

The plurality of bridge electrodes CE may be disposed on a differentlayer from the driving electrode TE and the sensing electrode RE. Thebridge electrode CE may include a first portion CEa and a second portionCEb. For example, the first portion CEa of the bridge electrode CE maybe connected to the driving electrode TE disposed on one side through afirst contact hole CNT1 and extend in a third direction DR3. The secondportion CEb of the bridge electrode CE may be bent from the firstportion CEa in an area overlapping the sensing electrode RE to extend ina second direction DR2, and may be connected to the driving electrode TEdisposed on the other side through the first contact hole CNT1.Hereinafter, a first direction DR1 may be a direction between the X-axisdirection and the Y-axis direction, a second direction DR2 may be adirection between the opposite direction of the Y-axis and the X-axisdirection, a third direction DR3 may be an opposite direction of thefirst direction DR1, and a fourth direction DR4 may be an oppositedirection of the second direction DR2. Accordingly, each of theplurality of bridge electrodes CE may connect the adjacent drivingelectrodes TE in the Y-axis direction.

The plurality of sensing electrodes RE may extend in the X-axisdirection and may be spaced apart from each other in the Y-axisdirection. The sensing electrodes RE adjacent in the X-axis directionmay be electrically connected through a connection portion RCE. Forexample, the connection portion RCE of the sensing electrodes RE may bedisposed within the shortest distance between the driving electrodes TEadjacent to each other.

For example, the plurality of driving electrodes TE, the plurality ofsensing electrodes RE, and the plurality of dummy electrodes DME may beformed in a planar mesh structure or a mesh structure. The plurality ofdriving electrodes TE, the plurality of sensing electrodes RE, and theplurality of dummy electrodes DME may surround each of first to thirdemission areas EA1, EA2, and EA3 of a pixel group PG in plan view.Accordingly, the plurality of driving; electrodes TE, the plurality ofsensing electrodes RE, and the plurality of dummy electrodes DME may notoverlap first, second and third emission areas EA1, EA2, and EA3. Theplurality of bridge electrodes CE may also not overlap the first tothird emission areas EA1, EA2, and EA3. Accordingly the display device10 may prevent the luminance of light conned from the first to thirdemission areas EA1, EA2, and EA3 from being reduced by the touch sensingunit TSU.

Each of the plurality of driving electrodes TE may include a firstportion TEa extending in the first direction DR1 and a second portionTEb extending in the second direction DR2., Each of the plurality ofsensing electrodes RE may include a first portion REa extending in thefirst direction DR1 and a second portion REb extending in the seconddirection DR2.

The plurality of pixels may include first, second and third sub-pixels,and each of the first to third sub-pixels may include the first to thirdemission areas EA1, EA2, and EA3. For example, the first emission areaEA1 may emit light of a first color or red light, the second emissionarea EA2 may emit light of a second color or green light, and the thirdemission area EA3 may emit light of a third color or blue light, but isnot limited thereto.

One pixel group PG may represent a white gray scale by including onefirst emission area EA1, two second emission areas EA2, and one thirdemission area EA3, but the configuration of the pixel group PG is notlimited thereto. The white gray scale may be represented by acombination of light emitted from one first emission area EA1, lightemitted from two second emission areas EA2, and light emitted from onethird emission area EA3.

FIG. 8 is a cross-sectional view taken along line I-I′ of FIG. 7 .

Referring to FIG. 8 , the display panel 100 may include the displayunit. DU and the touch sensing unit TSU. The display unit DU may includethe substrate SUB, the thin film transistor layer TFTL, the lightemitting element layer EML, and the encapsulation layer TFEL.

The substrate SUB may be a base substrate or a base member. Thesubstrate SUB may be a flexible substrate which can be bent, folded orrolled. For example, the substrate SUB may include an insulatingmaterial such as a polymer resin such as polyimide (PI), but the presentdisclosure is not limited thereto. As another example, the SUB mayinclude a glass material or a metal material.

The thin film transistor layer TFTL may include a first buffer layerBF1, a light blocking layer BML, a second buffer layer BF2, a thin filmtransistor TFT, a gate insulating layer GL, a first interlayerinsulating layer ILD1, a capacitor electrode CPE, a second interlayerinsulating layer ILD2, a first anode connection electrode ACN1, a firstpassivation layer PAS1, a second anode connection electrode ACN2, and asecond passivation layer PAS2.

The first buffer layer BF1 may be disposed on the substrate SUB. Thefirst buffer layer BF1 may include an inorganic layer capable ofpreventing penetration of air or moisture, For example, the first bufferlayer BF1 may include a plurality of inorganic layers alternatelystacked.

The light blocking layer BML may be disposed on the first buffer layerBF1. For example, the light blocking layer BML may be formed as a singlelayer or multiple layers made of any one of molybdenum (Mo), aluminum(Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium(Nd) and copper (Cu) or an alloy thereof. As another example, the lightblocking layer BML may be an organic layer including a black pigment.

The second buffer layer BF2 may be disposed on the first buffer layerBF1 and the light blocking layer BML. The light blocking layer BML maybe sandwiched between the first and second buffer layers BF1 and BF2.The second buffer layer BF2 may include an inorganic layer capable ofpreventing penetration of air or moisture For example, the second bufferlayer BF2 may include a plurality of inorganic layers alternatelystacked.

The thin film transistor TFT may be disposed on the second buffer layerBF2, and may constitute a pixel circuit of each of a plurality ofpixels. For example, the thin film transistor TFT may be a switchingtransistor or a driving transistor of the pixel circuit. The thin filmtransistor TFT may include a semiconductor region ACT, a sourceelectrode SE, a drain electrode DE, and a gate electrode GE.

The semiconductor region ACT, the source electrode SE, and the drainelectrode DE may be disposed on the second butler layer BF2. Thesemiconductor region ACT, the source electrode SE, and the drainelectrode DE may overlap the light blocking layer BML in a thicknessdirection. The semiconductor region ACT may overlap the gate electrodeGE in the thickness direction, and may be insulated from the gateelectrode GE by the gate insulating layer GL. The source electrode SEand the drain electrode DE may be formed by making a material of thesemiconductor region ACT conductive.

The gate electrode GE may be disposed on the gate insulating layer GL.The gate electrode GE may overlap the semiconductor region ACT with thegate insulating layer GI interposed therebetween.

The gate insulating layer GI may be disposed on the semiconductor regionACT, the source electrode SE, and the drain electrode DE. For example,the gate insulating layer GI may cover the semiconductor region ACT, thesource electrode SE, the drain electrode DE, and the second buffer layerBF2, and may insulate the semiconductor region ACT from the gateelectrode GE. The gate insulating layer GI may include a contact bolethrough which the first anode connection electrode ACN1 passes. Thecontact hole may expose a portion of the drain electrode DE.

The first interlayer insulating layer ILD1 may be disposed on the gateelectrode GE and the gate insulating layer GI. The first interlayerinsulating layer ILD1 may include a contact hole through which the firstanode connection electrode ACN1 passes. The contact hole of the firstinterlayer insulating layer ILD1 may be connected to the contact hole ofthe gate insulating layer GI and the contact hole of the secondinterlayer insulating layer ILD2.

The capacitor electrode CPE may be disposed on the first interlayerinsulating layer ILD1. The capacitor electrode CPE may overlap the gateelectrode GE in the thickness direction. The capacitor electrode CPE andthe gate electrode GE may form a capacitance. In this case, thecapacitor electrode CPE and the gate electrode GE may correspond to twoterminals of a capacitor.

The second interlayer insulating layer ILD2 may be disposed on thecapacitor electrode CPE and the first interlayer insulating layer ILD1.The second interlayer insulating layer ILD2 may include a contact holethrough which the first anode connection electrode ACN1 passes. Thecontact hole of the second inter layer insulating layer ILD2 may beconnected to the contact hole of the first interlayer insulating layerILD1 and the contact hole of the gate insulating layer GI.

The first anode connection electrode ACN1 may be disposed on the secondinterlayer insulating layer ILD2. The first anode connection electrodeACN1 may connect the drain electrode DE of the thin film transistor TFTto the second anode connection electrode ACN2. The first anodeconnection electrode ACN1 may be inserted into a contact hole providedin the second interlayer insulating layer ILD2, the contact holeprovided in the first interlayer insulating layer ILD1, and the contacthole provided in the gate insulating layer GI to be in contact with thedrain electrode DE of the thin film transistor TFT.

The first passivation layer PAS1 may be disposed on the first anodeconnection electrode ACN1 and the second interlayer insulating layerILD2. The first passivation layer PAS1 may protect the thin filmtransistor TFT. The first passivation layer PAS1 may include a contacthole through which the second anode connection electrode ACN2 passes.

The second anode connection electrode ACN2 may be disposed on the firstpassivation layer PAS1. The second anode connection electrode ACN2 mayconnect the first anode connection electrode ACN1 to a pixel electrodeAND of light emitting element LED. The second anode connection electrodeACN2 may be inserted into a contact hole provided in the firstpassivation layer PAS1 to be in contact with the first anode connectionelectrode ACN1.

The second passivation layer PAS2 may be disposed on the second anodeconnection electrode ACN2 and the first passivation layer PAS1. Thesecond passivation layer PAS2 may include a contact hole through whichthe pixel electrode AND of the light emitting element LED passes.

The light emitting element layer EML may be disposed on the thin filmtransistor layer TFTL. The light emitting element layer EML may includethe light emitting element LED and a pixel defining layer PDL. The lightemitting element LED may include the pixel electrode AND, a lightemitting layer EL, and a common electrode CAT.

The pixel electrode AND may be disposed on the second passivation layerPAS2. The pixel electrode AND may be disposed to overlap one of thefirst to third emission areas EA1, EA2, and EA3 defined by the pixeldefining layer PDL. The pixel electrode AND may be connected to thedrain electrode DE of the thin film transistor TFT through the first andsecond anode connection electrodes ACN1 and ACN2.

The light emitting layer EL may be disposed on the pixel electrode AND.For example, the light emitting layer EL may be an organic lightemitting layer made of an organic material, but is not limited thereto.In the case of employing the organic light emitting layer as the lightemitting layer EL, the thin film transistor TFT applies a predeterminedvoltage to the pixel electrode AND of the light emitting element LED,and if the common electrode CAT of the light emitting element LEDreceives a common voltage or a cathode voltage, holes and electrons canmove to the light emitting layer EL through a hole transport layer andan electron transport layer and combine to produce light to be emittedby the light emitting layer EL.

The common electrode CAT may be arranged on the light emitting layer EL.For example, the common electrode CAT may be an electrode common to allof the pixels rather than individually specific to each of the pixels.The common electrode CAT may be disposed on the light emitting layer ELin the first to third emission areas EA1, EA2, and EA3, and may bedisposed on the pixel defining layer PDL in an area other than the firstto third emission areas EA1, EA2, and EA3. For example, the commonelectrode CAT may be disposed on the pixel defining layer PDL betweenthe second and third emission areas EA2 and EA3.

The common electrode CAT may receive the common voltage or a lowpotential voltage. When the pixel electrode AND receives a voltagecorresponding to the data voltage and the common electrode CAT receivesthe common voltage, a potential difference is formed between the pixelelectrode AND and the common electrode CAT, so that the light emittinglayer EL may emit light.

The pixel defining layer PDL may define the first to third emissionareas EA1, EA2, and EA3. The pixel defining layer PDL may separate andinsulate the pixel electrode AND of each of the plurality of lightemitting elements ED.

The encapsulation layer TFEL may be disposed on the common electrode CATto cover the plurality of light emitting elements LED. The encapsulationlayer TFEL may include at least one inorganic layer to prevent oxygen ormoisture from penetrating into the light emitting element layer EML. Theencapsulation layer TFEL may include at least one organic layer toprotect the light emitting element layer EML from foreign matters suchas dust.

The touch sensing unit TSU may be disposed on the encapsulation layerTFEL. The touch sensing unit TSU may include a third buffer layer BF3,the bridge electrode CE, a first insulating layer SIL1, the drivingelectrode TE, the sensing electrode RE, and a second insulating layerSIL2.

The third buffer layer BF3 may be disposed on the encapsulation layerTFEL. The third buffer layer BF3 may have an insulating and opticalfunction. The third buffer layer BF3 may include at least one inorganiclayer. Optionally, the third buffer layer BF3 may be omitted.

The bridge electrode CE may be disposed on the third buffer layer BF3.The bridge electrode CE may be disposed on a different layer from thedriving electrode TE and the sensing electrode RE, and may connect theadjacent driving electrodes TE in the Y-axis direction.

The first insulating layer SIL1 may be disposed on the bridge electrodeCE and the third buffer layer BF3. The first insulating layer SIL1 mayhave an insulating and optical function. For example, the firstinsulating layer SIL1 may be an inorganic layer containing at least oneof a silicon nitride layer, a silicon oxynitride layer, a silicon oxidelayer, a titanium oxide layer, or an aluminum oxide layer.

The driving electrode TE and the sensing electrode RE may be disposed onthe first insulating layer SIL1. Each of the driving electrode TE andthe sensing electrode RE may not overlap the first to third emissionareas EA1, EA2, and EA3. For example, each of the driving electrode TEand the sensing electrode RE may overlap the pixel defining layer FOILEach of the driving electrode TE and the sensing electrode RE may beformed of a single layer containing molybdenum (Mo), titanium (Ti),copper (Cu), aluminum (Al), or indium tin oxide (ITO), or may be formedto have a stacked structure (Ti/Al/Ti) of aluminum and titanium, astacked structure (ITO/Al/ITO) of aluminum and ITO, an Ag—Pd—Cu (APC)alloy, or a stacked structure (ITO/APC/ITO) of APC alloy and ITO.

The second insulating layer SIL2 may be disposed on the drivingelectrode TE, the sensing electrode RE, and the first insulating layerSIL1. The second insulating layer SIL2 may have an insulating andoptical function. The second insulating layer SIL2 may be made of thematerial used in association with the first insulating layer SIL1.

FIG. 9 is a cross-sectional view illustrating a display area and anon-display area in a display device according to au embodiment of thepresent disclosure. The cross-sectional view of FIG. 9 further includesa non-display area in the cross-sectional view of FIG. 8 , and the sameconfiguration as the above-described configuration will be brieflydescribed or omitted.

Referring to FIG. 9 , the non-display au NDA and the touch peripheralarea TOA may include the plurality of switching transistors EMT and thecommon voltage line VCL. The plurality of switching transistors EMT mayinclude a first switching transistor EMT1 and a second switchingtransistor EMT2. FIG. 9 illustrates an example of the second switchingtransistor EMT2, but the first switching transistor EMT1 may also beformed in the same manner as the second switching transistor EMT2.

The second switching transistor EMT2 may be disposed on the secondbuffer layer BF2 and may be connected between the sensing electrodes REand the common voltage line VCL. The second switching transistor EMT2may be disposed on the same layer as the thin film transistor TFT of thedisplay unit DU. The second switching transistor EMT2 may include thesemiconductor region ACT, the drain electrode DE, the source electrodeSE, and the gate electrode GE.

The semiconductor region ACT, the drain electrode DE, and the sourceelectrode SE may be arranged on the second buffer layer BF2. Thesemiconductor region ACT, the drain electrode DE, and the sourceelectrode SE may overlap the light blocking layer BML in a thicknessdirection. The semiconductor region ACT may overlap the gate electrodeGE in the thickness direction, and may be insulated from the gateelectrode GE by the gate insulating layer GI. The drain electrode DE andthe source electrode SE may be formed by making a material of thesemiconductor region ACT conductive.

The gate electrode GE may be disposed on the gate insulating layer GI.The gate electrode GE may overlap the semiconductor region ACT with thegate insulating layer GI interposed therebetween.

A first connection electrode CNE1 may be disposed on the secondinterlayer insulating layer ILD2. The first connection electrode CNE1may be disposed on the same layer as the first anode connectionelectrode ACN1 and the common voltage line VCL. The first connectionelectrode CNE1 may connect the drain electrode DE of the secondswitching transistor EMT2 to a second connection electrode CNE2. Thefirst connection electrode CNE1 may be inserted into a contact holeprovided in the second interlayer insulating layer ILD2, the firstinterlayer insulating layer ILD1, and the gate insulating layer GI to bein contact with the drain electrode DE of the second switchingtransistor EMT2.

The second connection electrode CNE2 may be disposed on a first metallayer YML1 of the touch sensing unit TSU. The first metal layer YML1 mayinclude the bride electrode CE and the second connection electrode CNE2.The second connection electrode CNE2 may be inserted into a contact holeprovided in the third buffer layer BF3, the second protection layerPAS2, and the first passivation layer PAS1 to be in contact with thefirst connection electrode CNE1.

The driving electrode TE and the sensing electrode RE may be disposed ona second metal layer YML2 of the touch sensing unit TSU. The sensingelectrode RE disposed on the left side of the touch sensor area TSA mayextend to the touch peripheral area TOA, and may be inserted into asecond contact hole CNT2 provided in the first insulating layer SIL1 tobe in contact with the second connection electrode CNE2. Accordingly,the sensing electrode RE may be electrically connected to the drainelectrode DE of the second switching transistor EMT2 through the firstand second connection electrodes CNE1 and CNE2.

The common voltage line VCL may be disposed on the second interlayerinsulating layer ILD2. The common voltage line VCL may be disposed onthe same layer as the first connection electrode CNE1 and the firstanode connection electrode ACN1. The common voltage line VCL may extendto the first touch pad unit TP1 via the outer edge of the touchperipheral area TOA. The common voltage line VCL may supply a commonvoltage to the sensing electrode RE through the second switchingtransistor EMT2 turned on during the electromagnetic sensing period.Here, the common voltage of the common voltage line VCL may be the sameas the common voltage supplied to the common electrode CAT of thedisplay unit DU, but is not limited thereto.

As another example, the common voltage line VCL may be disposed on thefirst metal layer YML1 or the second metal layer YML2 of the touchsensing unit TSU. In this case, the common voltage line VCL may beelectrically connected to the source electrode SE of the secondswitching transistor EMT2 through at least one connection electrode.

FIG. 10 is a view illustrating a sensing driving process and thecharging of an input member in a sensing system according to anembodiment of the present disclosure, and FIG. 11 is a view illustratingthe discharging of an input member and the input sensing process in thesensing system according to an embodiment of the present disclosure.FIG. 12 is a waveform diagram illustrating a plurality of first drivingsignals, a plurality of second driving signals, a control signal, anelectromotive force of an input member, and a differential sensingsignal in a sensing system according to an embodiment of the presentdisclosure.

Referring to FIGS. 10 to 12 , the sensing system may include the displaydevice 10 and the input member 20. The display device 10 may include thedisplay panel 100, the display driver 200, the circuit board 300, andthe touch driver 400.

The touch driver 400 may include a driving signal supply unit 410, asensing signal receiving unit 420, a switching unit 430, and a controlunit 450.

The driving signal supply unit 410 may be electrically connected to theplurality of driving electrodes TE through the switching unit 430 andthe driving line TL. The driving signal supply unit 410 may supply afirst driving signal TDS to the plurality of driving electrodes TEduring the charging period of the electromagnetic sensing period EMR.For example, the driving signal supply unit 410 may supply a firstdriving signal TDS to some of the plurality of driving electrodes TE. Asanother example, the driving signal supply unit 410 may sequentiallysupply the first driving signal TDS to the plurality of drivingelectrodes TE. The first driving signal TDS may be a signal having aplurality of driving pulses. The first driving signal TDS may be a sinewave, a pulse wave, or a ramp wave having a predetermined frequency, butis not limited thereto. The frequency of the first driving signal TDSmay correspond to a resonant frequency of the input member 20. Forexample, the frequency of the first driving signal TDS may be the sameas a resonant frequency of a resonant circuit unit 22 of the inputmember 20, but is not limited thereto. The touch driver 400 may sensethe touch of the input member 20 by receiving a signal of a specificfrequency by the touch of the input member 20.

The driving signal supply unit 410 may include a first driving signaloutput module 411 and a second driving signal output module 412. Thefirst driving signal output module 411 may supply a first-first drivingsignal TDS1 haying a first phase to a first driving electrode TE1.through a first driving line TL1 during the charging period of theelectromagnetic sensing period EMR. The first driving electrode TE1 maybe a driving electrode disposed to one side of a specific point PT amongthe plurality of driving electrodes TE. The second driving signal outputmodule 412 may supply a first-second driving signal TDS2 having a secondphase opposite to the first phase to a second driving electrode TE2through a second driving line TL2 during the charging period of theelectromagnetic sensing period EMR. A difference between the first phaseand the second phase may be 180 degrees. The second driving electrodeTE2 may be a driving electrode disposed to the other side of thespecific point PT among the plurality of driving electrodes TE. Forexample, the second driving electrode TE2 may be disposed adjacent tothe first driving electrode TE1. As another example, the second drivingelectrode TE2 may be spaced apart from the first driving electrode TE1with at least one driving electrode TE interposed therebetween.

For example, when the first driving electrode TE1 receives thefirst-first driving signal TDS1 having the first phase, a current I mayflow in the Y-axis direction and a magnetic field may be generatedclockwise with respect to the Y-axis direction. When the second drivingelectrode TE2 receives the first-second driving signal TDS2 having thesecond phase opposite to the first phase, a current I may flow in adirection opposite to the Y-axis direction, and a magnetic field may begenerated counterclockwise with respect to the Y-axis direction.Accordingly, the directions of the magnetic fields of the first drivingelectrode TE1 and the second driving electrode TE2 may coincide at thespecific point PT, and thus, according to constructive interference ofthe magnetic fields, a magnetic field VMF may be generated in the thirddirection (Z-axis direction).

The input member 20 may be a stylus pen that supports an electromagneticresonance method by using the driving electrode TE or the sensingelectrode RE. The input member 20 may output a radio frequency signal inresponse to a magnetic field or electromagnetic signal of the touchsensing unit TSU.

The input member 20 may include a conductive tip 21 and the resonantcircuit unit 22. The conductive tip 21 may be disposed on one end of theinput member 20. The conductive tip 21 may form a capacitance with atleast one of the plurality of touch electrodes SEN when the input member20 touches the touch sensing unit TSU. The conductive tip 21 may be adielectric including a metal material or conductive rubber, but is notlimited thereto.

The resonant circuit unit 22 may include a coil L1 and a capacitor C1.The coil L1 may receive the magnetic field VMF formed in the thirddirection (Z-axis direction) induced by the touch sensing unit TSU togenerate an induced current, The induced current flowing through theresonant circuit unit 22 may charge the capacitor C1. For example, an LCresonant frequency of the input member 20 may be determined based on thecapacitance of the capacitor C1 and the inductance of the coil L1.

The input member 20 may be charged during the charging period of theelectromagnetic sensing period EMR. When the input member 20 is adjacentto or in contact with the specific point PT, the input member 20 mayreceive the magnetic field VMF formed in the third direction (Z-axisdirection) induced from the current I flowing through the first andsecond driving electrodes TE1 and TE2 during the charging period of theelectromagnetic sensing period EMR. The coil L1 of the input member 20may generate an induced current, and the induced current may charge thecapacitor C1. Accordingly, the electromotive force EMF of the capacitorC1 may increase during the charging period of the electromagneticsensing period EMR.

The input member 20 may be discharged during the discharging period ofthe electromagnetic sensing period EMR. When the input member 20 isadjacent to or in contact with the specific point PT, if the supply ofthe magnetic field VMF formed in the third direction (Z-axis direction)is stopped by the interruption of the supply of the first-first andfirst-second driving signals TDS1 and TDS2, the capacitor C1 may bedischarged. Accordingly, a current may flow in the coil L1 in adirection opposite to that of the induced current, and the coil L1 maygenerate the magnetic field VMF passing through the specific point PT ina direction opposite to the third direction (Z-axis direction). Theelectromotive force EMF of the capacitor C1 may decrease during thedischarging period of the electromagnetic sensing period EMR.

For example, when the magnetic field VMF passes through the specificpoint PT in a direction opposite to the third direction (Z-axisdirection), a magnetic field may be generated counterclockwise withrespect to the Y-axis direction around the first driving electrode TE1,and the current I of the first driving electrode TE1 may flow in adirection opposite to the Y-axis direction. Accordingly, the firstdriving electrode TE1 may provide a first sensing signal having a firstphase to the touch driver 400. When the magnetic field VMF passesthrough the specific point PT in a direction opposite to the thirddirection (Z-axis direction), a magnetic field may be generatedclockwise with respect to the Y-axis direction around the second drivingelectrode TE2, and the current I of the second driving electrode TE2 mayflow in the Y-axis direction. Accordingly, the second driving electrodeTE2 may provide a second sensing signal having a second phase oppositeto the first phase to the touch driver 400.

The sensing signal receiving unit 420 may be connected to the pluralityof driving, electrodes TE through the switching unit 430 and the drivingline TL. The sensing signal receiving unit 420 may receive sensingsignals of the plurality of driving electrodes TE through the drivingline TL during the discharging period of the electromagnetic sensingperiod EMR. The sensing signal receiving unit 420 may be a differentialamplifier. The sensing signal receiving unit 420 may differentiallyamplify the plurality of sensing signals to output a differentialsensing signal SER. Here, differential amplification refers toamplifying a voltage difference between two input signals. Accordingly,the sensing signal receiving unit 420 may amplify a voltage differencebetween the plurality of sensing signals to output the differentialsensing signal SER.

The sensing signal receiving unit 420 may include a first input terminal421, a second input terminal 422, and an output terminal 423. When theinput member 20 is adjacent to or in contact with the specific point PT,the first input terminal 421 may receive the first sensing signal havingthe first phase from the first driving electrode TE1 through the firstdriving line TL1, and the second input terminal 422 may receive thesecond sensing signal having the second phase opposite to the firstphase from the second driving electrode TE2 through the second drivingline TL2. The sensing signal receiving unit 420 may amplify a differencebetween the first and second sensing signals to output the differentialsensing signal SER through the output terminal 423. The sensing signalreceiving unit 420 may cancel (e.g., remove) noise included in the firstand second sensing signals, and may amplify a difference between thefirst and second sensing signals to improve touch sensitivity.

The switching unit 430 may selectively connect the driving line TL toone of the driving signal supply unit 410 and the sensing signalreceiving unit 420. The switching unit 430 may connect the drivingsignal supply unit 410 to the driving line TL during the charging periodof the input member 20. The switching unit 430 may connect the sensingsignal receiving unit 420 to the driving line TL during the dischargingperiod of the input member 20. For example, the switching unit 430 mayperiodically connect each of the driving signal supply unit 410 and thesensing signal receiving unit 420 to the driving line TL. As anotherexample, the switching unit 430 may connect each of the driving signalsupply unit 410 and the sensing signal receiving unit 420 to the drivingline TL based on a switching control signal of the control unit 450.

The switching unit 430 may include a first switching unit 431 and asecond switching unit 432. The first switching unit 431 may connect thefirst driving signal output module 411 to the first driving line TL1during the charging period of the electromagnetic sensing period EMR.The first driving signal output module 411 may supply the first-firstdriving signal TDS1 to the first driving electrode TE1 during thecharging period of the electromagnetic sensing period EMR.

The first switching unit 431 may connect the first input terminal 421 ofthe sensing signal receiving unit 420 to the first driving line TL1during the discharging period of the electromagnetic sensing period EMR.The first input terminal 421 may receive the first sensing signal fromthe first driving electrode TE1 during the discharging period of theelectromagnetic sensing period EMR.

The second switching unit 432 may connect the second driving signaloutput module 412 to the second driving line TL2 during the chargingperiod of the electromagnetic sensing period EMR. The second drivingsignal output module 412 may supply the first-second driving signal TDS2to the second driving electrode TE2 during the charging period of theelectromagnetic sensing period EMR.

The second switching unit 432 may connect the second input terminal 422of the sensing signal receiving unit 420 to the second driving line TL2during the discharging period of the electromagnetic sensing period EMR.The second input terminal 422 may receive the second sensing signal fromthe second driving electrode TE2 during the discharging period of theelectromagnetic sensing period EMR.

The control unit 450 may control the operation of the driving signalsupply unit 410, the sensing signal receiving unit 420, and theswitching unit 430. The control unit 450 may control the operationtiming of the driving signal supply unit 410, the sensing signalreceiving unit 420, and the switching unit 430 during the chargingperiod and the discharging period of the electromagnetic sensing periodEMR. For example, the controller 450 may receive the differentialsensing signal SER and determine whether the input of the input member20 has been made at the specific point PT. As another example, thecontrol unit 450 may receive a plurality of differential sensing signalsSER to determine the input coordinates of the input member 20. When thefrequency of the differential sensing signal SER corresponds to a presetfrequency band, the control unit 450 may determine that the input member20 has been touched, but the present disclosure is not limited thereto.

Accordingly, the touch driver 400 may supply the first-first andfirst-second driving signals TDS1 and TDS2 having opposite phases to thefirst and second driving electrodes TE1 and TE2 disposed to both sidesof the specific point PT, respectively, to generate the magnetic fieldVMF in the third direction (Z-axis direction) by constructiveinterference of magnetic fields, thereby charging the input member 20.The touch driver 400 may differentially amplify the first and secondsensing signals induced based on the magnetic field VMF in an oppositedirection of the third direction (Z-axis direction) according to thedischarge of the input member 20 to output the differential sensingsignal SER and may determine whether the input of the input member 20has been made.

Each of the first and second driving electrodes TE1 and TE2 may beconnected to the common voltage line VCL through the first switchingtransistor EMT1 during the electromagnetic sensing period EMR. Theelectromagnetic control line ECL may supply a control signal ECS of thegate-on level to a plurality of first switching transistors EMT1 duringthe electromagnetic sensing period EMR. For example, one end of thedriving electrodes TE connected to the driving line TL may correspond tothe driving electrode TE disposed on the lower side of the touch sensorarea TSA in FIG. 5 , and the other end of the driving electrode TEconnected to the first switching transistor EMT1 may correspond to thedriving electrode TE disposed on the upper side of the touch sensor areaTSA in FIG. 5 . The common voltage line VCL may supply a common voltageto the other end of the driving electrodes TE disposed farthest from thedriving line TL or the touch driver 400, so that the potential of theother end of the driving electrodes TE may be stably maintained.Accordingly, the common voltage line VCL may supply a common voltage tothe other end of the driving electrodes TE, so that the sensingsensitivity at the other end of the driving electrodes TE may beimproved. The display device 10 may include the switching transistor EMTand the common voltage line VCL disposed in the touch peripheral areaTOA, so that the reliability of the sensor may be secured over theentire area of the touch sensor area TSA.

FIGS. 10 to 12 illustrate the process of sensing the touch of the inputmember 20 using the plurality of driving electrodes TE, but the displaydevice 10 may supply the second driving signal RDS to the plurality ofsensing electrodes RE in the same manner to sense the touch of the inputmember 20.

The touch driver 400 may sense the input of the user's body dining thefirst period and sense the input of the input member 20 during thesecond period. For example, the first period may be a touch sensingperiod FTS, and the second period may be an electromagnetic sensingperiod EMR.

The touch driver 400, during the self-capacitance sensing periodSelf-Cap of the touch sensing period FTS, may supply the plurality offirst driving signals TDS to the plurality of driving electrodes TE, andmay supply the plurality of second driving signals RDS to the pluralityof sensing electrodes RE. The touch driver 400 may sense an amount ofchange of the self-capacitance of each of the plurality of drivingelectrodes TE and the plurality of sensing electrodes RE by receivingthe sensing signal from each of the plurality of driving electrodes TEand the plurality of sensing electrodes RE during the self-capacitancesensing period Self-Cap of the touch sensing period FTS.

The touch driver 400 may supply the plurality of first driving signalsTDS to the plurality of driving electrodes TE during the mutualcapacitance sensing period Mutual-Cap of the touch sensing period FTS.The touch driver 400 may sense an amount of change of the mutualcapacitance between the plurality of driving electrodes TE and theplurality of sensing electrodes RE by receiving the sensing signal fromthe plurality of sensing electrodes RE during the mutual capacitancesensing period Mutual-Cap of the touch sensing period FTS.

The electromagnetic control line ECL may supply the control signal ECSof the gate-off level to the plurality of switching transistors EMTduring the touch sensing period FTS. Accordingly, the plurality ofswitching transistors EMT may be turned off during the touch sensingperiod FTS.

The display device 10 may sense the touch of the input member 20 byusing the touch sensing unit TSU that senses the touch of the user'sbody. The display device 10 may sense a touch of the user's body duringthe touch sensing period FTS using the touch sensing unit TSU, and maysense the approach or contact of the input member 20 such as an inputpen during, the electromagnetic sensing, period EMR. Accordingly, thedisplay device 10 may not include a separate sensor layer or a digitizerlayer for the electromagnetic resonance of the input member 20, so thatthe thickness of the display device 10 may be decreased, and the costsmay be reduced.

FIG. 13 is a timing diagram illustrating the operation of a displaydriver and a touch driver in a display device according to an embodimentof the present disclosure.

Referring to FIG. 13 , the display driver 200 may drive the display unitDU at a driving frequency of A Hz (A being a positive integer). In aplurality of display frame periods DFT1, DFT2, DFT3, and DFT4, thedisplay driver 200 may supply a gate signal and a data voltage to theplurality of pixels during a display period DSP, and may stop the supplyof the gate signal and the data voltage during a display standby periodDW. Each of first, second, third and fourth display frame periods DFT1,DFT2, DFT3, and, DFT4 may correspond to 1/a sec (a being a positiveinteger). For example, the display driver 200 may sequentially supply agate signal to the pixels arranged along, a plurality of rows during thedisplay period DSP in the first display frame period DFT1, and theplurality of pixels may display images in an order selected by the gatesignal. The display driver 200 may not supply the gate signal and thedata voltage to the plurality of pixels during the display standbyperiod DW in the first display frame period DFT1, and voltages in theplurality of pixels may be initialized.

The touch driver 400 may be synchronized with the display driver 200 todrive the touch sensing unit TSU. The touch driver 400 may receive atiming control signal from a main processor or a main controller, andmay be synchronized with the display driver 200. For example, the touchdriver 400 may drive the touch sensing unit TSU at a driving frequencyof N times (N being a positive integer) the driving frequency of thedisplay driver 200 but is not limited thereto.

The touch driver 400 may drive the touch sensing unit TSU at a drivingfrequency of B Hz (B being a positive integer). The touch driver 400 maydrive the touch sensing unit TSU during a plurality of touch frameperiods SFT1, SFT2, SFT3, SFT4, SFT5, SFT6, SFT7 and SFT8 determined bythe driving frequency. The touch driver 400 may sense the touch of theuser's body during a touch sensing period. FTS in a first touch frameperiod SFT1, may sense the touch of the input member 20 during theelectromagnetic sensing period EMR in the first touch frame period SFT1,and may stop the supply of the drinking signal during a touch standbyperiod WS in the first touch frame period SFT1. This may be repeated ineach of the second to eighth frame periods SFT1 to SFT8.

Referring to FIG. 13 in conjunction with FIG. 12 , the touch driver 400,during the self-capacitance sensing period Self-Cap of the touch sensingperiod FTS, may supply the plurality of first driving signals TDS to theplurality of driving electrodes TE, and may supply the plurality ofsecond driving signals RDS to the plurality of sensing electrodes RE.The touch driver 400 may sense an amount of change of theself-capacitance of each of the plurality of driving electrodes TE andthe plurality of sensing electrodes RE by receiving the sensing signalfrom each of the plurality of driving electrodes TE and the plurality ofsensing electrodes RE during the self-capacitance sensing periodSelf-Cap of the touch sensing period FTS.

The touch driver 400 may supply the plurality of first driving signalsIDS to the plurality of driving electrodes TE during the mutualcapacitance sensing period Mutual-Cap of the touch sensing period FTS.The touch driver 400 may sense an amount of change of the mutualcapacitance between the plurality of driving electrodes TE and theplurality of sensing electrodes RE by receiving the sensing signal fromthe plurality of sensing electrodes RE during the mutual capacitancesensing period Mutual-Cap of the touch sensing period FTS.

The touch driver 400 may supply the first-first and first-second drivingsignals TDS1 and TDS2 and receive the first and second sensing signalsduring the electromagnetic sensing period EMR to determine whether theinput of the input member 20 has been made. Accordingly, the touchdriver 400 may sense both the input of the user's body and the input ofthe input member 20 during the first touch frame period SFT1.

The touch driver 400 may sequentially perform the touch sensing periodFTS, the electromagnetic sensing period EMR, and the touch standbyperiod WS during the first touch frame period SFT1, but the order of thetouch method is not limited thereto. The length of the touch sensingperiod FTS may be greater than the length of the electromagnetic sensingperiod EMR, but the present disclosure is not limited thereto.

FIG. 14 is a graph illustrating the sensing sensitivity of a sensingsystem according to an embodiment of the present disclosure.

Referring to FIG. 14 , when the plurality of switching transistors EMTare turned off (EMT off) during the electromagnetic sensing period EMR,the common voltage line VCL may not supply a common voltage to thedriving electrodes TE and the sensing electrodes RE during theelectromagnetic sensing period EMR. In this case, a sensing value by thetouch electrodes SEN adjacent to the touch driver 400 may be relativelyhigh (touch driver side), and a sensing value by the touch electrodesSEN spaced far apart from the touch driver 400 may be relatively low(VCL side). Accordingly, when the plurality of switching transistors EMTare turned off (EMT off) during the electromagnetic sensing period EMR,a difference in sensing sensitivity may occur according to the positionof the touch electrodes SEN. The configuration in which the plurality ofswitching transistors EMT are turned off during the electromagneticsensing period EMR (EMT off) may correspond to the configuration inwhich the touch sensing unit TSU does not include the plurality ofswitching transistors EMT and the common voltage line VCL.

When the plurality of switching transistors EMT are turned on (EMT on)during the electromagnetic sensing period EMR, the common voltage lineVCL may supply a common voltage to the driving electrodes TE and thesensing electrodes RE during the electromagnetic sensing period EMR. Inthis case, a value sensed by the touch electrodes SEN spaced far apartfrom the touch driver 400 may be relatively increased (VCL side).Accordingly, when the plurality of switching transistors EMT are turnedon (EMT on) during the electromagnetic sensing period EMR, the sensingsensitivity by the touch electrodes SEN adjacent to the common voltageline VCL (VCL side) may be improved. The display device 10 may includethe switching transistor EMT and the common voltage line VCL disposed inthe touch peripheral area TOA, so that the reliability of the sensor maybe secured over the entire area of the touch sensor area TSA.

FIG. 15 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure, and FIG. 16is a waveform diagram illustrating a plurality of first driving signals,a plurality of second driving signals, a first control signal, a secondcontrol signal, an electromotive force of an input member, and adifferential sensing signal in a sensing system according to anembodiment of the present disclosure. The touch sensing unit TSU of FIG.15 has a different configuration of the common voltage line VCL and theelectromagnetic control line in the touch sensing unit TSU of FIG. 5 ,and the same configuration as the above-described configuration for FIG.5 will be briefly described or omitted.

Referring to FIGS. 15 and 16 , the touch sensor area TSA may include theplurality of touch electrodes SEN and the plurality of dummy electrodesDME, The plurality of touch electrodes SEN may include a plurality ofdriving electrodes TE and a plurality of sensing electrodes RE.

The touch peripheral area TOA may include the driving line TL, thesensing line RL, the plurality of switching transistors EMT, theelectromagnetic control line ECL, and the common voltage line VCL.

The switching transistor EMT may be a switching element connectedbetween the plurality of touch electrodes SEN and the common voltageline VCL. The plurality of switching transistors EMT may include a firstswitching transistor EMT1 and a second switching transistor EMT2. Thefirst switching transistor EMT1 may be disposed on the upper side of thetouch peripheral area TOA, The first switching transistor EMT1 may bedisposed on the opposite side of the driving line TL. The firstswitching transistor EMT1 may be connected to the driving electrodes TEdisposed fluffiest from the driving line TL. The first switchingtransistor EMT1 may be disposed between the driving electrodes TE andthe first common voltage line VCL1 disposed on the upper side of thetouch sensor area TSA. The first switching transistor EMT1 may be turnedon based on a first control signal ECS1 of a first electromagneticcontrol line ECL1. In other words, the first switching transistor EMT1may be turned on in response to the first control signal ECS1. The firstelectromagnetic control line ECL1 may supply the first control signalECS1 of the gate-on level to the plurality of first switching.transistors EMT1 during a first electromagnetic sensing period EMR1. Thefirst switching transistor EMT1 may be turned off during the touchsensing period FTS and a second electromagnetic sensing period EMR2, andthe driving electrodes TE may not receive a common voltage. The firstswitching transistor EMT1 may be turned on during the firstelectromagnetic sensing period EMR1 to supply a common voltage to thedriving electrodes TE.

The second switching transistor EMT2 may be disposed on the left side ofthe touch peripheral area TOA. In the alternative, the second switchingtransistor EMT2 may be disposed on the right side of the touchperipheral area TOA when the sensing line RL is disposed on the leftside of the touch peripheral area TOA, The second switching transistorEMT2 may be disposed on the opposite side of the sensing line RL. Thesecond switching transistor EMT2 may be connected to the sensingelectrodes RE disposed farthest from the sensing line RL. The secondswitching transistor EMT2 may be disposed between the sensing electrodesRE and a second common voltage line VCL2 disposed on the left side ofthe touch sensor area TSA. The second switching transistor EMT2 may beturned on based on a second control signal ECS2 of a secondelectromagnetic control line ECL2. In other words, the second switchingtransistor EMT2 may be turned on in response to the second controlsignal ECS2. The second electromagnetic control line ECL2 may supply thesecond control signal ECS2 of the gate-on level to a plurality of secondswitching transistors EMT2 during the second electromagnetic sensingperiod EMR2. The second switching transistor EMT2 may be turned offduring the touch sensing period FTS and the first electromagneticsensing period EMR1, and the sensing electrodes RE may not receive acommon voltage. The second switching transistor EMT2 may be turned onduring the second electromagnetic sensing period EMR2 to supply a commonvoltage to the sensing electrodes RE.

The electromagnetic control line ECL may supply a control signal to thegate electrode of the plurality of switching transistors EMT Theelectromagnetic control line ECL may include the first and secondelectromagnetic control lines ECL1 and ECL2.

The first electromagnetic control line ECL1 may supply the first controlsignal ECS1 to the gate electrode of the first switching transistorEMT1. The first electromagnetic control line ECL1 may extend to thefirst touch pad unit TP1 via the upper side, the left side, and thelower side of the touch peripheral area TOA.

The second electromagnetic control line ECL2 may supply the secondcontrol signal ECS2 to the gate electrode of the second switchingtransistor EMT2. The second electromagnetic control line ECL2 may extendto the first touch pad unit TP1 via the left side and the lower side ofthe touch peripheral area. TOA, In this configuration, the first andsecond switching transistors EMT1 and EMT2 may be independentlycontrolled.

The common voltage line VCL may be disposed along the periphery of thetouch peripheral area TOA. The common voltage line VCL may include thefirst and second common voltage lines VCL1 and VCL2. The first commonvoltage line VCL1 may be disposed closer to the edges of the touchperipheral area TOA than the second common voltage line VCL2. Inaddition, the first electromagnetic control line ECL1 may be disposedbetween the first and second common voltage lines VCL1 and VCL2. Thefirst common voltage line VCL1 may extend to the first touch pad unitTP1 via the upper side, the left side, and the lower side of the touchperipheral area TOA. The first common voltage line VCL1 may supply acommon voltage to the driving electrodes TE during the firstelectromagnetic sensing period EMR1. The second common voltage Fine VCL2may extend to the first touch pad unit TP1 via the left side and thelower side of the touch peripheral area TOA. The second common voltageline VCL2 may supply a common voltage to the sensing electrodes REduring the second electromagnetic sensing period EMR2. For example, thecommon voltage of the first and second common voltage lines VCL1 andVCL2 and the common voltage supplied to the display unit. DU may be thesame, but are not limited thereto. As another example, the commonvoltages of the first and second common voltage lines VCL1 and VCL2 maybe different from each other. One common voltage of the first and secondcommon voltage lines VCL1 and VCL2 may have a constant potential, andthe other common voltage of the first and second common voltage linesVCL1 and VCL2 may be a sine wave, a pulse wave, or a ramp wave having apredetermined frequency.

The driving electrodes TE may be connected to the first common voltageline VCL1 through the first switching transistor EMT1 during the firstelectromagnetic sensing period EMR1. The first electromagnetic controlline ECL1 may supply the first control signal ECS1 of the gate-on levelto the plurality of first switching transistors EMT1 during the firstelectromagnetic sensing period EMR1. The first common voltage line VCL1may supply a common voltage to the other end of the driving electrodesTE disposed farthest from the driving line TL or the touch driver 400,so that the potential of the other end of the driving electrodes TE maybe stably maintained. The first common voltage line VCL1 may supply acommon voltage to the other end of the driving electrodes TE, so thatthe sensing sensitivity at the other end of the driving electrodes TEmay be improved.

The sensing electrodes RE may be connected to the second common voltageline VCL2 through the second switching transistor EMT2 during the secondelectromagnetic sensing period EMR2. The second electromagnetic controlline ECL2 may supply the second control signal ECS2 of the gate-on levelto a plurality of second switching transistors EMT2 during the secondelectromagnetic sensing period EMR2. The second common voltage line VCL2may supply a common voltage to the other end of the sensing electrodesRE disposed farthest from the sensing line RL or the touch driver 400,so that the potential of the other end of the sensing electrodes RE maybe stably maintained. The second common voltage line VCL2 may supply acommon voltage to the other end of the sensing electrodes RE, so thatthe sensing sensitivity at the other end of the sensing electrodes REmay be improved.

Accordingly, the display device 10 may include the first and secondswitching transistors EMT1 and EMT2 and the first and second commonvoltage lines VCL1 and VCL2 disposed in the touch peripheral area TOA,so that the reliability of the sensor may be secured over the entirearea of the touch sensor area TSA.

The touch driver 400, during the self-capacitance sensing periodSelf-Cap of the touch sensing period FTS, may supply the plurality offirst driving signals TDS to the plurality of driving electrodes TE, andmay supply the plurality of second driving signals R DS to the pluralityof sensing electrodes RE. The touch driver 400 may sense an amount ofchange of the self-capacitance of each of the plurality of drivingelectrodes TE and the plurality of sensing electrodes RE by receivingthe sensing signal from each of the plurality of driving electrodes TEand the plurality of sensing electrodes RE during the self-capacitancesensing period Self-Cap of the touch sensing period FTS.

The touch driver 400 may supply the plurality of first driving signalsTDS to the plurality of driving electrodes TE during the mutualcapacitance sensing period Mutual-Cap of the touch sensing period FTS.The touch driver 400 may sense an amount of change of the mutualcapacitance between the plurality of driving electrodes TE and theplurality of sensing electrodes RE by receiving the sensing signal fromthe plurality of sensing electrodes RE during the mutual capacitancesensing period Mutual-Cap of the touch sensing period FTS.

The first electromagnetic control line ECL1 may supply the first controlsignal ECS1 of the gate-off level to the first switching transistor EMT1during the touch sensing period FTS. The second electromagnetic controlline ECL2 may supply the second control signal ECS2 of the gate-offlevel to the second switching transistor EMT2 during the touch sensingperiod FTS. Accordingly, the first and second switching transistors EMT1and EMT2 may be turned off during the touch sensing period FTS.

The display device 10 may sense the touch of the input member 20 byusing the touch sensing unit TSU that senses the touch of the user'sbody. The display device 10 may sense a touch of the user's body duringthe touch sensing period FTS using the touch sensing unit TSU, and maysense the approach or contact of the input member 20 such as an inputpen during the first and second electromagnetic sensing periods EMR1 andEMR2. Accordingly, the display device 10 may not include a separatesensor layer or a digitizer layer for the electromagnetic resonance ofthe input member 20, so that the thickness of the display device 10 maybe decreased, and the costs may be reduced.

FIG. 17 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure. The touchsensing unit TSU of FIG. 17 has a different configuration of the voltageline VCL and the electromagnetic control line ECL by further includingthe extension line ETL in the touch sensing unit TSU of FIG. 5 , and thesame configuration as the above-described configuration for FIG. 5 willbe briefly described or omitted.

Referring to FIG. 17 , the touch sensor area TSA may include a pluralityof touch electrodes SEN and a plurality of dummy electrodes DME. Theplurality of touch electrodes SEN may include a plurality of drivingelectrodes TE and a plurality of sensing electrodes RE.

The touch peripheral area TOA may include the driving line IL, thesensing line RL, the plurality of extension lines ETL, the plurality ofswitching transistors EMT, the electromagnetic control line ECL, and thecommon voltage line VCL.

The plurality of extension lines ETL may electrically connect the touchelectrodes SEN to the plurality of switching transistors EMT. Theplurality of extension lines ETL may include first and second extensionlines ETL1 and ETL2. The first extension line ETL1 may be connected tothe driving electrodes TE disposed on the upper side of the touch sensorarea TSA. The first extension line ETL1 may extend to the firstswitching transistor EMT1 via the upper side and the left side of thetouch peripheral area TOA. Accordingly, the first extension line ETL1may electrically connect the driving electrodes TE to the firstswitching transistor EMT1. Although FIG. 17 shows four first extensionlines ETL1 this is merely an example and the number of first extensionlines ETL1 may correspond to the number of columns of driving electrodesTE in the touch peripheral area TOA.

The second extension line ETL2 may be connected to the sensingelectrodes RE disposed on the left side of the touch sensor area TSA.The second extension line ETL2 may extend to the second switchingtransistor EMT2 via the left side of the touch peripheral area TOA.Accordingly, the second extension line ETL2 may electrically connect thesensing electrodes RE to the second witching transistor EMT2. AlthoughFIG. 17 shows four second extension lines ETL2, this is merely anexample and the number of second extension lines ETL2 may correspond tothe number of row of sensing electrodes RE in the touch peripheral areaTOA.

The switching transistor EMT may be a switching element connectedbetween the plurality of touch electrodes SEN and the common voltageline VCL. The plurality of switching transistors EMT may include a firstswitching transistor EMT1 and a second switching transistor EMT2. Thefirst and second switching transistors EMT1 and EMT2 may be disposed ina line on the lower side of the touch peripheral area TOA. The firstswitching transistor EMT1 ma be connected to the driving electrodes TEdisposed farthest from the driving line TL through the first extensionline ETL1. The first switching transistor EMT1 may be electricallyconnected between the driving electrodes TE and the common voltage lineVCL disposed on the upper side of the touch sensor area TSA. The firstswitching transistor EMT1 may be turned on based on the control signalECS of the electromagnetic control line ECL. The electromagnetic controlline ECL may supply a control signal ECS of the gate-on level to aplurality of first switching transistors EMT1 during the electromagneticsensing period EMR. The first switching transistor EMT1 may be turnedoff during the touch sensing period FTS, and the driving electrodes TEmay not receive a common voltage. The first switching transistor EMT1may be turned on during the electromagnetic sensing period EMR to supplya common voltage to the driving electrodes TE.

The second switching transistor EMT2 may be connected to the sensingelectrodes RE disposed farthest from the sensing line RL through thesecond extension line ETL2. The second switching transistor EMT2 may beelectrically connected between the sensing electrodes RE and the commonvoltage line VCL disposed on the left side of the touch sensor area TSA.The second switching transistor EMT2 may be turned on based on thecontrol signal ECS of the electromagnetic control line ECL. Theelectromagnetic control line ECL may supply the control signal ECS ofthe gate-on level to the plurality of second switching transistors EMT2during the electromagnetic sensing period EMR. The second switchingtransistor EMT2 may be turned off during the touch sensing period FTS,and the sensing electrodes RE may not receive a common voltage. Thesecond switching transistor EMT2 may be turned on during theelectromagnetic sensing period EMR to supply a common voltage to thesensing electrodes RE.

The electromagnetic control line ECL may supply the control signal ECSto the gate electrode of the first and second switching transistors EMT1and EMT2. The electromagnetic. control line ECL may extend to the firsttouch pad unit TP1 via the lower side of the touch peripheral area TOA.

The common voltage line VCL may be disposed outside the touch peripheralarea TOA, The common voltage line VCL may extend to the first touch padunit TP1 via the lower side of the touch peripheral area TOA. The commonvoltage line VCL may not extend along the left and upper sides of thetouch peripheral area TOA. The common voltage line VCL may supply acommon voltage to the driving electrodes TE and the sensing electrodesRE during the electromagnetic sensing period EMR. For example, thecommon voltage of the common voltage line VCL may be the same as thecommon voltage supplied to the display unit DU, but is not limitedthereto. As another example, the common voltage of the common voltageline VCL may have a constant potential. As another example, the commonvoltage of the common voltage line VCL may be a sine wave, a pulse wave,or a ramp wave having a predetermined frequency.

The driving electrodes TE may be connected to the common voltage lineVCL through the first extension line ETL1 and the first switchingtransistor EMT1 during the electromagnetic sensing period EMR. Theelectromagnetic control line ECL may supply a control signal ECS of thegate-on level to a plurality of first switching transistors EMT1 duringthe electromagnetic sensing period EMR. The common voltage line VCL maysupply a common voltage to the other end of the driving electrodes TEdisposed farthest from the driving line TL or the touch driver 400, sothat the potential of the other end of the driving electrodes TE may bestably maintained. The common voltage line VCL may supply a commonvoltage to the other end of the driving electrodes TE, so that thesensing sensitivity at the other end of the driving electrodes TE may beimproved.

The sensing electrodes RE may be connected to the common voltage lineVCL through the second extension line ETL2 and the second switchingtransistor EMT2 during the electromagnetic sensing period EMR. Theelectromagnetic control line ECL may supply the control signal ECS ofthe gate-on level to the plurality of second switching transistors EMT2during the electromagnetic sensing period EMR. The common voltage lineVCL may supply a common voltage to the other end of the sensingelectrodes RE disposed farthest from the sensing line RL or the touchdriver 400, so that the potential of the other end of the sensingelectrodes RE may be stably maintained. The common voltage line VCL maysupply a common voltage to the other end of the sensing electrodes RE,so that the sensing sensitivity at the other end of the sensingelectrodes RE may be improved.

Accordingly, the display device 10 may include the first and secondextension lines ETL1 and ETL2, the first and second switchingtransistors EMT1 and EMT2, and the common voltage line VCL disposed inthe touch peripheral area TOA, so that reliability of the sensor may besecured over the entire area of the touch sensor area TSA.

As another example, the plurality of switching transistors EMT and thecommon voltage line VCL may be disposed on the circuit board 300. Inthis case, the connection relationship between the extension line ETL,the plurality of switching transistors EMT, and the common voltage lineVCL may be the same as the configuration illustrated in FIG. 17 . Asanother example, the touch driver 400 may include the plurality ofswitching transistors EMT and a common voltage line VCL. In this case,the extension line ETL may be connected to the touch driver 400.

FIG. 18 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure. The touchsensing unit TSU of FIG. 18 further includes a demultiplexer DMX in thetouch sensing unit TSU of FIG. 17 , and the same configuration as theabove-described configuration for FIG. 17 will be briefly described oromitted.

Referring to FIG. 18 , the touch sensor area TSA may include a pluralityof touch electrodes SEN and a plurality of dummy electrodes DME. Theplurality of touch electrodes SEN may include a plurality of drivingelectrodes TE and a plurality of sensing electrodes RE.

The touch peripheral area TOA may include the driving line TE, thesensing line RL, the plurality of extension lines ETL, a plurality ofdemultiplexers DMX, the electromagnetic control line ECL, and the commonvoltage line VCL.

The plurality of extension lines ETL may electrically connect the touchelectrodes SEN to the plurality of demultiplexers DMX. The plurality ofextension lines ETL may include the first and second extension linesETL1 and ETL2. The first extension line ETL1 may be connected to thedriving electrodes TE disposed on the upper side of the touch sensorarea TSA. The first extension line ETL1 may extend to a firstdemultiplexer DMX1 via the upper side and the left side of the touchperipheral area TOA. Accordingly, the first extension line ETL1 mayelectrically connect the driving electrodes TE to the firstdemultiplexer DMX1.

The second extension line ETL2 may be connected to the sensingelectrodes RE disposed on the left side of the touch sensor area TSA.The second extension line ETL2 may extend to a second demultiplexer DMX2via the left side of the touch peripheral area TOA. Accordingly, thesecond extension line ETL2 may electrically connect the sensingelectrodes RE to the second demultiplexer DMX2.

The plurality of demultiplexers DMX may be a switching element connectedbetween the plurality of touch electrodes SEN and the common voltageline VCL. The plurality of demultiplexers DMX may include the first andsecond demultiplexers DMX1 and DMX2. The first and second demultiplexersDMX1 and DMX2 may be disposed on the lower side of the touch peripheralarea TOA. The first demultiplexer DMX1 may time-divide one input intotwo outputs. The first demultiplexer DMX1 may electrically connect thefirst extension line ETL1 to the driving line TL or the common voltageline VCL based on the control signal ECS of the electromagnetic controlline ECL. The first demultiplexer DMX1 may electrically connect thefirst extension line ETL1 to the driving line TL during the touchsensing period FTS. In other words, one end of the driving electrodes TEdirectly connected to the driving line TL and the other end of thedriving electrodes TE directly connected to the first extension lineETL1 may be connected to each other to be connected to the touch driver400. Accordingly, the first demultiplexer DMX1 may reduce the resistanceof the plurality of driving electrodes TE, and the sensing sensitivityto the touch of the user's body may be improved.

The first demultiplexer DMX1 may electrically connect the firstextension line ETL1 to the common voltage line VCL during theelectromagnetic sensing period EMR. Accordingly, the first demultiplexerDMX1 may supply a common voltage to the other end of the drivingelectrodes TE through the first extension line ETL1, and may improve thesensing sensitivity at the other end of the driving electrodes TE. Thedisplay device 10 may secure the reliability of the sensor over theentire area of the touch sensor area TSA.

The second demultiplexer DMX2 may time-divide one input into twooutputs. The second demultiplexer DMX2 may electrically connect thesecond extension line ETL2 to the sensing line RL or the common voltageline VCL based on the control signal ECS of the electromagnetic controlline ECL. The second demultiplexer DMX2 may electrically connect thesecond extension line ETL2 to the sensing line RL during the touchsensing period FTS. In other words, one end of the sensing electrodes REdirectly connected to the sensing line RL and the other end of thesensing electrodes RE directly connected to the second extension lineETL2 may be connected to each other to be connected to the touch driver400. Accordingly, the second demultiplexer DMX2 may reduce theresistance of the plurality of sensing electrodes RE, and the sensingsensitivity to the touch of the user's body may be improved,

The second demultiplexer DMX2 may electrically connect the secondextension line ETL2 to the common voltage line VCL during theelectromagnetic sensing period EMR. Accordingly, the seconddemultiplexer DMX2 may supply a common voltage to the other end of thesensing electrodes RE through the second extension line ETL2, and mayimprove the sensing sensitivity at the other end of the sensingelectrodes RE, The display device 10 may secure the reliability of thesensor over the entire area of the touch sensor area TSA.

The electromagnetic control line may supply the control signal ECS tothe first and second demultiplexers DMX1 and DMX2. The electromagneticcontrol line ECL may extend to the first touch pad unit TP1 via thelower side of the touch peripheral area TOA.

The common voltage line VCL may be disposed outside the touch peripheralarea TOA. The common voltage line VCL may extend to the first touch padunit TP1 via the lower side of the touch peripheral area TOA. The commonvoltage line VCL may not extend to the left and upper sides of the touchperipheral area TOA. The common voltage line VCL may supply a commonvoltage to the driving electrodes TE and the sensing electrodes REduring the electromagnetic sensing period EMR. For example, the commonvoltage of the common voltage line VCL may be the same as the commonvoltage supplied to the display unit DU, but is not limited thereto. Asanother example, the common voltage of the common voltage line VCL mayhave a constant potential. As another example, the common voltage of thecommon voltage line VCL may be a sine wave, a pulse wave, or a ramp wavehaving a predetermined frequency.

As another example, the plurality of demultiplexers DMX and the commonvoltage line VCL may be disposed on the circuit board 300. In this case,the connection relationship between the extension line ETL, theplurality of demultiplexers DMX, the driving line TL, the sensing lineRL, and the common voltage line VCL may be the same as the configurationillustrated in FIG. 18 . AS another example, the touch driver 400 mayinclude the plurality of demultiplexers DMX and the common voltage lineVCL. In this case, the extension line ETL may be connected to the touchdriver 400.

FIG. 19 is a circuit diagram illustrating one example of a firstdemultiplexer in the display device of FIG. 18 . Since the configurationof the second demultiplexer DMX2 may be the same as the configuration ofthe first demultiplexer DMX1 and the driving timing may be different,the description of the second demultiplexer DMX2 will be omitted.

Referring to FIG. 19 , the first demultiplexer DMX1 may include firstand second demux transistors DMT1 and DMT2. The first and second demuxtransistors DMT1 and DMT2 may correspond to different types oftransistors.

The first demux transistor DMT1 may correspond to a p-type transistor,but is not limited thereto. A gate electrode of the first demuxtransistor DMT1 may be connected to the electromagnetic control line ECLThe first demux transistor DMT1 may be turned on by receiving thecontrol signal ECS of the gate low level from the electromagneticcontrol line The control signal ECS may be provided to theelectromagnetic control line ECL in response to a signal provided to thefirst touch pad unit TP1. A first electrode of the first demuxtransistor DMT1 may be connected to the first extension line ETL1through a first node N1, and a second electrode of the first demuxtransistor DMT1 may be connected to the driving line TL.

The second demux transistor DMT2 may correspond to an n-type transistor,but is not limited thereto. A gate electrode of the second demuxtransistor DMT2 may be connected to the electromagnetic control lineECL. The second demux transistor DMT2 may be turned on by receiving thecontrol signal ECS of the gate high level from the electromagneticcontrol line ECL. A first electrode of the second demux transistor DMT2may be connected to the first extension line ETL1 through the first nodeN1, and a second electrode of the second demux transistor DMT2 may beconnected to the common voltage line VCL. As can be seen, the first nodeN1 may be connected to each of the first and second demux transistorsDMT1 and DMT2.

FIG. 20 is a circuit diagram illustrating another example of a firstdemultiplexer in the display device of FIG. 18 .

Referring to FIG. 20 , the first demultiplexer DMX1 may include thefirst and second demux transistors DMT1 and DMT2. The first and seconddemux transistors DMT1 and DMT2 may correspond to the same type oftransistor.

The first demux transistor DMT1 may correspond to an n-type transistor,but is not limited thereto. A gate electrode of the first demuxtransistor DMT1 may be connected to the first electromagnetic controlline ECL1. The first demux transistor DMT1 may be turned on by receivingthe first control signal ECS1 of the gate high level from the firstelectromagnetic control line ECL1. A first electrode of the first demuxtransistor DMT1 may be connected to the first extension line ETL1through a first node N1, and a second electrode of the first demuxtransistor DMT1 may be connected to the driving line TL.

The second demux transistor DMT2 may correspond to an n-type transistor,but is not limited thereto. The gate electrode of the second demuxtransistor DMT2 may be connected to the second electromagnetic controlline ECL2. The second demux transistor DMT2 may be turned on byreceiving the second control signal ECS2 of the gate high level from thesecond electromagnetic control line ECL2. A first electrode of thesecond demux transistor DMT2 may be connected to the first extensionline ETL1 through the first node N1, and a second electrode of thesecond demux transistor DMT2 may be connected to the common voltage lineVCL. By connecting the first and second demux transistors DMT1 and DMT2to different electromagnetic control lines, the first and second demuxtransistors DMT1 and DMT2 may be independently controlled.

FIG. 21 is a circuit diagram illustrating yet another example of a firstdemultiplexer in the display device of FIG. 18 .

Referring to FIG. 21 , the first demultiplexer DMX1 may include thefirst and second demux transistors DMT1 and DMT2. The first and seconddemux transistors DMT1 and DMT2 may correspond to the same type oftransistor.

The first demux transistor DMT1 may correspond to a p-type transistor,but is not limited thereto. A gate electrode of the first demuxtransistor DMT1 may be connected to the first electromagnetic controlline ECL1. The first demux transistor DMT1 may be turned on by receivingthe first control signal ECS1 of the gate low level from the firstelectromagnetic control line ECL1. A first electrode of the first demuxtransistor DMT1 way be connected to the first extension line ETL1through a first node N1, and a second electrode of the first demuxtransistor DMT1 may be connected to the driving line TL.

The second demux transistor DMT2 may correspond to a p-type transistor,but is not limited thereto. The gate electrode of the second demuxtransistor DMT2 may be connected to the second electromagnetic controlline ECL2, The second demux transistor DMT2 may be turned on byreceiving the second control signal ECS2 of the gate low level from thesecond electromagnetic control line ECL2. A first electrode of thesecond demux transistor DMT2 may be connected to the first extensionline ETL1 through the first node N1, and a second electrode of thesecond demux transistor DMT2 may be connected to the common voltage lineVCL.

FIG. 22 is a plan view illustrating a touch sensing unit, a circuitboard, and a touch driver of a display device according to an embodimentof the present disclosure. FIG. 22 is a diagram illustrating aconnection relationship between the first and second touch pad units TP1and TP2 of the touch sensing unit TSU, and first and second contact padunits CP1 and CP2 of the circuit board 300, and the same configurationas the above-described configurations will be briefly described oromitted.

Referring to FIG. 22 , the display pad area DPA, the first touch padarea TPA1, and the second touch pad area TPA2 may be disposed at theedge of the sub-region SBA. The display pad area DPA, the first touchpad area TPA1, and the second touch pad area TPA2 may be electricallyconnected to the circuit board 300 by using a low-resistancehigh-reliability material such as an anisotropic conductive film or selfassembly anisotropic conductive paste (SAP).

The display pad area DPA may include a plurality of display pad unitsDP. The plurality of display pad units DP may be connected to the mainprocessor through the circuit board 300. Each of the plurality ofdisplay pad units DP may be connected to each of a plurality of thirdcontact pad units CP3 of the circuit board 300. The plurality of displaypad units DP may be connected to the circuit board 300 to receivedigital video data, and may supply the digital video data to the displaydriver 200.

The first touch pad area TPA1 may be disposed on one side of the displaypad area DPA, and may include a plurality of first touch pad units TP1.Each of the plurality of first touch pad units TP1 may be connected toeach of the plurality of first contact pad units CPI of the circuitboard 300. The plurality of first touch pad units TP1 may beelectrically connected to the touch driver 400 through the plurality offirst contact pad units CP1 and first lead lines LDL1. The plurality offirst touch pad units TP1 may supply the first driving signal TDS to theplurality of driving lines TL. The plurality of first touch pad unitsTP1 may supply a common voltage to the common voltage line VCL.

The second touch pad area TPA2 may be disposed on the other side of thedisplay pad area DPA, and may include a plurality of second touch padunits TP2. For example, the second touch pad area TPA2 may be disposedon a second side of the display pad area DPA, while the first touch padarea TPA1 may be disposed on a first side of the display pad are DPA.Each of the plurality of second touch pad units TP2 may be connected toeach of the plurality of second contact pad units CP2 of the circuithoard 300. The plurality of second touch pad units TP2 may beelectrically connected to the touch driver 400 through the plurality ofsecond contact pad units CP2 and second lead lines LDL2 The plurality ofsecond touch pad units TP2 may receive sensing signals from theplurality of sensing lines RL.

The touch driver 400 may be mounted on the circuit hoard 300. The touchdriver 400 may be connected to the plurality of driving lines TL, theelectromagnetic control line ECL, and the common voltage line VCLthrough the first lead line LDL1, the first contact pad unit CP1, andthe first touch pad unit TP1. The touch driver 400 may be connected tothe plurality of sensing lines RL through the second lead line LDL2, thesecond contact pad unit CP2, and the second touch pad unit TP2.

The touch driver 400, during the self-capacitance sensing periodSelf-Cap of the touch sensing period FTS, may supply the plurality offirst driving signals TDS to the plurality of driving electrodes TE, andmay supply the plurality of second driving signals RDS to the pluralityof sensing electrodes RE. The touch driver 400 may sense an amount ofchange of the self-capacitance of each of the plurality of drivingelectrodes TE and the plurality of sensing electrodes RE by receivingthe sensing signal from each of the plurality of driving electrodes TEand the plurality of sensing electrodes RE during the self-capacitancesensing period Self-Cap of the touch sensing period FTS.

The touch driver 400 may supply the plurality of first driving signalsTDS to the plurality of driving electrodes TE during the mutualcapacitance sensing period Mutual-Cap of the touch sensing period FTS.The touch driver 400 may sense an amount of change of the mutualcapacitance between the plurality of driving electrodes TE and theplurality of sensing electrodes RE by receiving the sensing signal fromthe plurality of sensing, electrodes RE during the mutual capacitancesensing period Mutual-Cap of the touch sensing period FTS. Accordingly,the touch driver 400 may sense the input of the user's body during thetouch sensing period FTS.

The touch driver 400 may supply the plurality of first driving signalsTDS to the plurality of driving electrodes TE during the electromagneticsensing period EMR. The touch driver 400 may sense the input of theinput member 20 by receiving sensing signals from the plurality ofdriving electrodes TE during the electromagnetic sensing period EMR. Thetouch driver 400 may supply the plurality of second driving signals RDSto the plurality of sensing electrodes RE during the electromagneticsensing period EMR. The touch driver 400 may sense the input of theinput member 20 by receiving sensing signals from the plurality ofsensing electrodes RE during the electromagnetic sensing period EMR.

The display device 10 may sense a touch of the user's body during thetouch sensing period FTS by including the touch driver 400 implementedas one integrated circuit (IC), and may sense an approach or contact ofthe input member 20 such as an input pen during the electromagneticsensing period EMR.

FIG. 23 is a plan view illustrating a touch sensing unit, a circuitboard, a touch driving circuit, and an electromagnetic driving circuitof a display device according to an embodiment of the presentdisclosure. The display device of FIG. 23 has different configurationsof the touch driving circuit 401 and the electromagnetic driving circuit402 from the display device of FIG. 22 , and the same configuration asthe above-described configuration of FIG. 22 will be briefly describedor omitted.

Referring to FIG. 23 , the touch driver 400 may include a touch drivingcircuit 401 and an electromagnetic driving circuit 402.

The touch driving circuit 401 may be connected to the plurality ofdriving lines TL, the electromagnetic control line ECL, and the commonvoltage line VCL through the first lead line LDL1 the first contact padunit CP1, and the first touch pad unit TP1. The touch driving circuit401 may be connected to the plurality of sensing, lines RL through thesecond lead line LDL2, the second contact pad unit CP2, and the secondtouch pad unit TP2.

The touch driving circuit 401, during the self-capacitance sensingperiod Self-Cap of the touch sensing period FTS, may supply theplurality of first driving signals TDS to the plurality of drivingelectrodes TE, and may supply the plurality of second driving signalsRDS to the plurality of sensing electrodes RE. The touch driving circuit401 may sense an amount of change of the self-capacitance of each of theplurality of driving electrodes TE and the plurality of sensingelectrodes RE by receiving the sensing signal from each of the pluralityof driving electrodes TE and the plurality of sensing electrodes REduring the self-capacitance sensing period Self-Cap of the touch sensingperiod FTS.

The touch driving circuit 401 may supply the plurality of first drivingsignals TDS to the plurality of driving electrodes TE during the mutualcapacitance sensing period Mutual-Cap of the touch sensing period FTS.The touch driving circuit 401 may sense an amount of change of themutual capacitance between the plurality of driving electrodes TE andthe plurality of sensing electrodes RE by receiving the sensing signalfrom the plurality of sensing electrodes RE during the mutualcapacitance sensing period Mutual-Cap. Accordingly, the touch drivingcircuit 401 may sense the input of the user's body during the touchsensing period FTS of the touch sensing period FTS.

The touch driving circuit 401 may supply an enable signal EN to theelectromagnetic driving circuit 402. The electromagnetic driving circuit402 may be synchronized with the touch driving circuit 401 based on theenable signal EN, and may drive the touch sensing unit TSU during theelectromagnetic sensing period EMR immediately after the touch sensingperiod FTS.

The electromagnetic driving circuit 402 may be connected to theplurality of driving lines TL, the electromagnetic control line ECL, andthe common voltage line VCL through a third lead line LDL3, the firstcontact pad unit CP1, and the first touch pad unit TP1. Theelectromagnetic driving circuit 402 may be connected to the plurality ofsensing lines RL through a fourth lead line LDL4, the second contact padunit CP2, and the second touch pad unit TP2.

The electromagnetic driving circuit 402 may supply the plurality offirst driving signals TDS to the plurality of driving electrodes TEduring the electromagnetic sensing period EMR. The electromagneticdriving circuit 402 may sense the input of the input member 20 byreceiving sensing signals from the plurality of driving electrodes TEduring the electromagnetic sensing period EMR. The electromagneticdriving circuit 402 may supply the plurality of second driving signalsRDS to the plurality of sensing electrodes RE during the electromagneticsensing period EMR. The electromagnetic driving circuit 402 may sensethe input of the input member 20 by receiving sensing signals from theplurality of sensing electrodes RE during the electromagnetic sensingperiod EMR.

The display device 10, by including the touch driving circuit 401 andthe electromagnetic driving circuit 402 implemented as separate ICs, maysense the touch of the user's body during the touch sensing period FTSusing the touch driving circuit 401, and may sense the approach orcontact of the input member 20 such as an input pen during theelectromagnetic sensing period EMR using the electromagnetic drivingcircuit 402.

FIG. 24 is a plan view illustrating a touch sensing unit, a circuitboard, a touch driving circuit, and an electromagnetic driving circuitof a display device according to an embodiment of the presentdisclosure.

Referring to FIG. 24 , the touch driver 400 may include the touchdriving circuit 401 and the electromagnetic driving circuit 402.

The electromagnetic driving circuit 402 may be connected to theplurality of driving lines TL, the electromagnetic control line ECL andthe common voltage line VCL through the first lead line LDL1, the firstcontact pad unit CP1, and the first touch pad unit TP1. Theelectromagnetic driving circuit 402 may be connected to the plurality ofsensing lines RL through the second lead line LDL2, the second contactpad unit CP2, and the second touch pad unit TP2.

The electromagnetic driving circuit 402 may supply the plurality offirst driving signals TDS to the plurality of driving electrodes TEduring the electromagnetic sensing period EMR. The electromagneticdriving circuit 402 may sense the input of the input member 20 byreceiving sensing signals from the plurality of driving electrodes TEduring the electromagnetic sensing period EMR. The electromagneticdriving circuit 402 may supply the plurality of second driving, signalsRDS to the plurality of sensing electrodes RE during the electromagneticsensing period EMR. The electromagnetic driving circuit 402 may sensethe input of the input member 20 by receiving sensing signals from theplurality of sensing electrodes RE during the electromagnetic sensing,period EMR.

The electromagnetic driving circuit 402 may supply the enable signal ENto the touch driving circuit 401. This is different from the embodimentof FIG. 23 in which the touch driving circuit 401 supplies to the enablesignal EN to the electromagnetic driving circuit 402, The touch drivingcircuit 401 may be synchronized with the electromagnetic driving circuit402 based on the enable signal EN, and may drive the touch sensing unitTSU during the touch sensing period FTS.

The touch driving circuit 401 may be connected to the plurality ofdriving lines TL, the electromagnetic control line ECL, and the commonvoltage line VCL through the third lead line LDL3, the first contact padunit CP1, and the first touch pad unit TP1. The touch driving circuit401 may be connected to the plurality of sensing lines RL through thefourth lead line LDL4, the second contact pad unit CP2, and the secondtouch pad unit TP2.

The touch driving circuit 401 may sense an amount of change of theself-capacitance of each of the plurality of driving electrodes TE andthe plurality of sensing electrodes RE during the self-capacitancesensing period Self-Cap of the touch sensing period FTS. The touchdriving circuit 401 may sense an amount of change of the mutualcapacitance between the plurality of driving electrodes TE and theplurality of sensing electrodes RE during the mutual capacitance sensingperiod Mutual-Cap of the touch sensing period FTS. Accordingly, thetouch driving circuit 401 may sense the input of the user's body duringthe touch sensing period FTS.

The display device 10, by including the touch driving circuit 401 andthe electromagnetic driving circuit 402 implemented as separate ICs, maysense the touch of the user's body during the touch sensing period FTSusing the touch driving circuit 401, and may sense the approach orcontact of the input member 20 such as an input pen during theelectromagnetic sensing, period EMR using the electromagnetic drivingcircuit 402.

FIG. 25 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure. The touchsensing unit TSU of FIG. 25 has a different configuration of a couplingcapacitor EMC from the touch sensing unit TSU of FIG. 5 , and the sameconfiguration as the above-described configuration of FIG. 5 will bebriefly described or omitted.

Referring to FIG. 25 , the touch sensing unit TSU may include a touchsensor area TSA for sensing a user's touch, and a touch peripheral areaTOA disposed around the touch sensor area TSA.

The touch sensor area TSA may include a plurality of touch electrodesSEN and a plurality of dummy electrodes DME. The plurality of touchelectrodes SEN may form mutual capacitance or self-capacitance to sensea touch of an object or a person. The plurality of touch electrodes SENmay include a plurality of driving electrodes TE and a plurality ofsensing electrodes RE.

The touch peripheral area TOA may include the driving line TL, thesensing line RL, a plurality of coupling capacitors EMC, and the commonvoltage line VCL.

The plurality of coupling capacitors EMC may include a first couplingcapacitor EMC1 and a second coupling capacitor EMC2. The first couplingcapacitor EMC1 may be disposed on the upper side of the touch peripheralarea TOA. The first coupling capacitor EMC1 may be disposed on theopposite side of the driving line TL. The first coupling capacitor EMC1may be connected to the driving electrodes TE disposed farthest from thedriving line TL. The first coupling capacitor EMC1 may be disposedbetween the driving electrodes TE and the common voltage line VCLdisposed on the upper side of the touch sensor area TSA. Accordingly,the first coupling capacitor EMC1 may maintain a potential differencebetween the driving electrodes TE and the common voltage line VCL. Thefirst coupling capacitor EMC1 may be connected to each driving electrodeTE column.

The second coupling capacitor EMC2 may be disposed on the left side ofthe touch peripheral area TOA. The second coupling capacitor EMC2 may bedisposed on the opposite side of the sensing line RL. The secondcoupling capacitor EMC2 may be connected to the sensing electrodes REdisposed farthest from the sensing line RL. The second couplingcapacitor EMC2 may be disposed between the sensing electrodes RE and thecommon voltage line VCL disposed on the left side of the touch sensorarea TSA. Accordingly, the second coupling capacitor EMC2 may maintain apotential difference between the sensing electrodes RE and the commonvoltage line VCL. The second coupling capacitor EMC2 may be connected toeach sensing electrode RE column.

The common voltage line VCL may be disposed along the periphery of thetouch peripheral area TOA. The common voltage line VCL may extend to thefirst touch pad unit TP1 via the upper side, the left side, and thelower side of the touch peripheral area TOA. The number of commonvoltage lines is not limited to that illustrated in FIG. 25 . Forexample, the common voltage of the common voltage line VCL may be thesame as the common voltage supplied to the display unit DU, but is notlimited thereto. As another example, the common voltage of the commonvoltage line VCL may have a constant potential. As another example, thecommon voltage of the common voltage line VCL may be a sine wave, apulse wave, or a ramp wave having a predetermined frequency.

One end of the plurality of driving electrodes TE may be connected tothe driving line TL, and the other end of the plurality of drivingelectrodes TE may be connected to the first coupling capacitor EMC1. Inother words, a first end of the plurality of driving electrodes IF maybe connected to the driving line TL, and a second end of the pluralityof driving electrodes TE may be connected to the first couplingcapacitor EMC1, The first coupling capacitor EMC1 may maintain apotential difference between the common voltage line VCL and the otherend (e.g., second end) of the driving electrodes TE disposed farthestfrom the driving line TL or the touch driver 400, and thus may stablymaintain the potential of the other end of the driving electrodes TE.The first coupling capacitor EMC1 may improve sensing sensitivity at theother end (e.g., second end) of the driving electrodes TE.

One end of the plurality of sensing electrodes RE may be connected tothe sensing line RL, and the other end of the plurality of sensingelectrodes RE may be connected to the second coupling capacitor EMC2. Inother words, a first end of the plurality of sensing electrodes RE maybe connected to the sensing line RL, and a second end of the pluralityof sensing electrodes RE may be connected to the second couplingcapacitor EMC2. The second coupling capacitor EMC2 may maintain apotential difference between the common voltage line VCL and the otherend (e.g., second end) of the sensing electrodes RE disposed farthestfrom the sensing line RL or the touch driver 400, and thus may stablymaintain the potential of the other end (e.g., second end) of thesensing electrodes RE. The second coupling capacitor EMC2 may improvesensing sensitivity at the other end of the sensing electrodes RE.

Accordingly, the display device 10 may include the coupling capacitorEMC and the common voltage line VCL disposed in the touch peripheralarea TOA, so that the reliability of the sensor may be secured over theentire area of the touch sensor area TSA.

The display device 10 may sense the touch of the input member 20 byusing the touch sensing unit TSU that senses the touch of the user'sbody. The display device 10 may sense a touch of the user's body duringthe touch sensing period FTS using the touch sensing unit TSU, and maysense the approach or contact of the input member 20 such as an inputpen during the electromagnetic sensing period EMR. Accordingly, thedisplay device 10 may not include a separate sensor layer or a digitizerlayer for the electromagnetic resonance of the input member 20, so thatthe thickness of the display device 10 may be decreased, and the costsmay be reduced.

FIG. 26 is a plan view illustrating an example of a touch sensing unitof the display device of FIG. 25 , and FIG. 27 is a cross-sectional viewtaken along line II-II′ of FIG. 26 .

Referring to FIGS. 26 and 27 , the non-display area NDA and the touchperipheral area TOA may include the second coupling capacitor EMC2.FIGS. 26 and 27 illustrate the example of the second coupling capacitorEMC2, but the first coupling capacitor EMC1 may also be formed in thesame manner as the second coupling capacitor EMC2.

The second coupling capacitor EMC2 may maintain a potential differencebetween the sensing electrodes RE and the common electrode CAT. Thesecond coupling capacitor EMC2 may include a first capacitor electrodeECP1 and a second capacitor electrode ECP2. The first capacitorelectrode ECP1 may be disposed on the first metal layer YML1 of thetouch sensing unit TSU. The first capacitor electrode ECP1 may beconnected to the sensing electrode RE of the touch sensor area TSAthrough a contact hole provided in the first insulating layer SIL1. Forexample, the sensing electrode RE connected to the first capacitorelectrode ECP1 may correspond to the sensing line RL or the other end ofthe sensing electrodes RE disposed farthest from the touch driver 400.The first capacitor electrode ECP1 may be a plate electrode having apredetermined area.

The second capacitor electrode ECP2 may be a portion of the commonvoltage line VCL integrally formed with the common electrode CAT of thedisplay unit DU. The second capacitor electrode ECP2 may correspond to aportion of the common voltage line VCL that overlaps the first capacitorelectrode ECP1. The common electrode CAT may be implemented in the formof an electrode common to all pixels of the display unit DU, and mayextend to the non-display area NDA. Accordingly, the common electrodeCAT may be a cathode electrode that supplies a common voltage to thelight emitting element LED of the display unit DU, and may be the secondcapacitor electrode ECP2 that supplies a common voltage to the secondcoupling capacitor EMC2 of the touch peripheral area TOA. Accordingly,the second capacitor electrode ECP2 may correspond to the common voltageline VCL of FIG. 25 , and the display device 10 may not include aseparate voltage line. The display device 10 may supply a common voltageto the second coupling capacitor EMC2 using the common electrode CAT ofthe display unit DU. The display device 10 may stably maintain thepotential of the other end of the sensing electrodes RE, and may improvethe sensing sensitivity at the other end of the sensing electrodes RE.

FIG. 28 is a plan view illustrating another example of a touch sensingunit of the display device of FIG. 25 , and FIG. 29 is a cross-sectionalview taken along line III-III′ of FIG. 28 .

Referring to FIGS. 28 and 29 , the non-display area NDA and the touchperipheral area TOA may include the second coupling capacitor EMC2.FIGS. 28 and 29 illustrate the example of the second coupling capacitorEMC2, but the first coupling capacitor EMC1 may also be formed in thesame manner as the second coupling capacitor EMC2.

The second coupling capacitor EMC2 may maintain a potential differencebetween the sensing electrodes RE and the common voltage line VCL. Thesecond coupling capacitor EMC2 may include a first capacitor electrodeECP1 and a second capacitor electrode ECP2.

The first capacitor electrode ECP1 may be disposed on the first metallayer YML1 of the touch sensing unit TSU. The first capacitor electrodeECP1 may be connected to the sensing electrode RE of the touch sensorarea TSA through a contact hole provided in the first insulating layerSIL1. For example, the sensing electrode RE connected to the firstcapacitor electrode ECP1 may correspond to the sensing line RL or theother end of the sensing electrodes RE disposed farthest from the touchdriver 400. The first capacitor electrode ECP1 may be a plate electrodehaving a predetermined area.

The second capacitor electrode ECP2 may be disposed on the second metallayer YML2 of the touch sensing unit TSU. The second capacitor electrodeECP2 may be connected to the common voltage line VCL disposed in thefirst metal layer YML1 through a contact hole provided in the firstinsulating layer SIL1. The second capacitor electrode ECP2 may receive acommon voltage from the common voltage line VCL. The second capacitorelectrode ECP2 may overlap the first capacitor electrode ECP1, and maybe a plate electrode having a predetermined area. The display device 10may supply a common voltage to the second coupling, capacitor EMC2 usingthe common voltage line VCL. The display device 10 may stably maintainthe potential of the other end of the sensing electrodes RE, and mayimprove the sensing sensitivity at the other end of the sensingelectrodes RE.

A plurality of trace lines TRC may be disposed on the second metal layerYML2. For example, the plurality of trace lines TRC may be disposed onthe first insulating layer SIL1. The plurality of trace lines IRC mayextend along the touch peripheral area TOA, and may be insulated fromthe common voltage line VCL or the second coupling capacitor EMC2. Apart of the plurality of trace lines TRC may be disposed between thesecond capacitor electrode ECP2 and the sensing electrode RE, andanother part of the plurality of trace lines TRC may be disposed outsidethe common voltage line VCL. For example, the second capacitor electrodeECP2 may be disposed between pairs of the plurality of trace lines TRC.The plurality of trace lines TRC may transmit a predetermined signal orvoltage. Optionally, the plurality of trace lines TRC may be omitted.

FIG. 30 is a plan view illustrating yet another example of a touchsensing unit of the display device of FIG. 25 .

Referring to FIG. 30 , the non-display area NDA and the touch peripheralarea TOA may include a second coupling capacitor EMC2. FIG. 30illustrates the example of the second coupling capacitor EMC2, but thefirst coupling capacitor EMC1 may also be formed in the same manner asthe second coupling capacitor EMC2.

The second coupling capacitor EMC2 may maintain a potential differencebetween the sensing electrodes RE and the common voltage line VCL. Thesecond coupling capacitor EMC2 may include a first capacitor electrodeECP1 and a second capacitor electrode ECP2. The first capacitorelectrode ECP1 may be disposed on the first metal layer YML1 of thetouch sensing unit TSU. The first capacitor electrode ECP1 may beconnected to the sensing electrode RE of the touch sensor area TSA. Thisconnection is illustrated by the three horizontal portions connectingthe first capacitor electrode ECP1 to the sensing electrodes RE. Forexample, the sensing electrode RE connected to the first capacitorelectrode ECP1 may correspond to the sensing line RE or the other end ofthe sensing electrodes RE disposed farthest from the touch driver 400.The first capacitor electrode ECP1 may be a plate electrode having apredetermined area. The plurality of first capacitor electrodes ECP1corresponding to each of the plurality of sensing electrodes RE may bespaced apart from each other in the Y-axis direction. For example, onefirst capacitor electrode ECP1 may correspond to the sensing electrodesRE connected to one sensing line RL, but is not limited thereto.

The second capacitor electrode ECP2 may be disposed on the second metallayer YML2 of the touch sensing unit TSU. The second capacitor electrodeECP2 and the common voltage line VCL may be integrally formed anddisposed on the second metal layer YML2. The common voltage line VCL mayextend in the Y-axis direction, and the second capacitor electrode ECP2may correspond to a portion of the common voltage line VCL that overlapsthe first capacitor electrode ECP1. The plurality of second capacitorelectrodes ECP2 may be connected to each other by the common voltageline VCL. The length of the second capacitor electrode ECP2 in theX-axis direction may be greater than the length of the common voltageline VCL in the X-axis direction, but is not limited thereto. The secondcapacitor electrode ECP2 may receive a common voltage from the commonvoltage line VCL. The display device 10 may supply a common voltage tothe second coupling capacitor EMC2 using the common voltage line VCL.The display device 10 may stably maintain the potential of the other endof the sensing electrodes RE, and may improve the sensing sensitivity atthe other end of the sensing electrodes RE.

A plurality of trace lines TRC may be disposed on the second metal layerYML2. The plurality of trace lines TRC may extend along the touchperipheral area TOA, and may be insulated from the common voltage lineVCL or the second coupling capacitor EMC2. A part of the plurality oftrace lines TRC may be disposed between the second coupling capacitorEMC2 and the sensing electrode RE, and another part of the plurality oftrace lines TRC may be disposed outside the common voltage line VCL. Theplurality of trace lines TRC may transmit a predetermined signal orvoltage. Optionally, the plurality of trace lines TRC may be omitted.

FIG. 31 is a graph illustrating sensing sensitivity of a sensing systemaccording to an embodiment of the present disclosure.

Referring to FIG. 31 , when the touch sensing unit TSU does not includethe coupling capacitor EMC (without the EMC), the potential of the otherend of the touch electrodes SEN may be unstable. In this case, a sensingvalue by the touch electrodes SEN adjacent to the touch driver 400 maybe relatively high (touch driver side), and a sensing value by the touchelectrodes SEN spaced far apart from the touch driver 400 may berelatively low (VCL side). Accordingly, when the touch sensing unit TSUdoes not include the coupling capacitor EMC (without the EMC), adifference in sensing sensitivity may occur according to the positionsof the touch electrodes SEN.

When the touch sensing unit TSU includes the coupling capacitor EMC(with the EMC), the plurality of coupling capacitors EMC may stablymaintain the potential of the other end of the touch electrodes SEN. Inthis case, a value sensed by the touch electrodes SEN spaced far apartfrom the touch driver 400 may be relatively increased (VCL side).Accordingly, when the touch sensing unit TSU includes the couplingcapacitor EMC (with the EMC), the sensing sensitivity by the touchelectrodes SEN adjacent to the common voltage line VCL may be improved(VCL side). The display device 10 may include the coupling capacitor EMCand the common voltage line VCL disposed in the touch peripheral areaTOA, so that the reliability of the sensor may be secured over theentire area of the touch sensor area TSA.

FIG. 32 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure. The touchsensing unit TSU of FIG. 32 has different configurations of the couplingcapacitor EMC and the common voltage line VCL from the touch sensingunit TSU of FIG. 25 , and the same configuration as the above-describedconfiguration of FIG. 25 will be briefly described or omitted.

Referring to FIG. 32 , the touch sensor area TSA may include a pluralityof touch electrodes SEN and a plurality of dummy electrodes DME, Theplurality of touch electrodes SEN may, include a plurality of drivingelectrodes TE and a plurality of sensing electrodes RE.

The touch peripheral area TOA may include the driving line TL, thesensing line RL, a plurality of coupling capacitors EMC, and theplurality of the common voltage line VCL.

The plurality of coupling capacitors EMC may include a first couplingcapacitor EMC1. and a second coupling capacitor EMC2. The first couplingcapacitor EMC1 may be disposed on the upper side of the touch peripheralarea TOA. The first coupling capacitor EMC1 may be disposed on theopposite side of the driving line TL. The first coupling capacitor EMC1may be connected to the driving electrodes TE disposed farthest from thedriving line TL. A part of the plurality of first coupling capacitorsEMC1 may be disposed between the driving electrodes TE and the firstcommon voltage line VCL1. In other words, first portion of the pluralityof first coupling capacitors EMC1 may be disposed between the drivingelectrodes TE and the first common voltage line VCL1. Another part ofthe plurality of first coupling capacitors EMC1 may be disposed betweenthe driving electrodes TE and the second common voltage line VCL2. Inother words, a second portion of the plurality of first couplingcapacitors EMC1 may be disposed between the driving electrodes TE andthe second common voltage line VCL2. For example, the plurality of firstcoupling capacitors EMC1 may be alternately connected to the first orsecond common voltage line VCL1 or VCL2 according to a disposed order,but the present disclosure is not limited thereto. Accordingly, thefirst coupling capacitor EMC1 may maintain a potential differencebetween the first or second common voltage line VCL1 or VCL2 and thedriving electrodes TE.

The second coupling capacitor EMC2 may be disposed on the left side ofthe touch peripheral area TOA. The second coupling capacitor EMC2 may bedisposed on the opposite side of the sensing line RL. The secondcoupling capacitor EMC2 may be connected to the sensing electrodes REdisposed farthest from the sensing line RL. A part of the plurality ofsecond coupling capacitors EMC2 may be disposed between the sensingelectrodes RE and a third common voltage line VCL3. In other words, afirst portion of the plurality of second coupling capacitors EMC2 may bedisposed between the sensing electrodes RE and a third common voltageline VCL3. Another part of the plurality of second coupling capacitorsEMC2 may be disposed between the sensing electrodes RE and a fourthcommon voltage line VCL4. In other words, a second portion of theplurality of second coupling capacitors EMC2 may be disposed between thesensing electrodes RE and a fourth common voltage line VCL4. Forexample, the second coupling capacitors EMC2 disposed on the upper sidemay be connected to the third common voltage line VCL3, and the secondcoupling capacitors EMC2 disposed on the lower side may be connected tothe fourth common voltage line VCL4, but the present disclosure is notlimited thereto. Accordingly, the second coupling capacitor EMC2 maymaintain a potential difference between the third or fourth commonvoltage line VCL3 or VCL4 and the sensing electrodes RE.

The common voltage line VCL may be disposed along the periphery of thetouch peripheral area TOA. The common voltage line VCL may include thefirst to fourth common voltage lines VCL1, VCL2, VCL3, and VCL4. Thefirst and second common voltage lines VCL1 and VCL2 may extend to thefirst touch pad unit TP1 via the upper side, the left side, and thelower side of the touch peripheral area TOA. The first and second commonvoltage lines VCL1 and VCL2 may be connected to the other end of theplurality of first coupling capacitors EMC1.

The third and fourth common voltage lines VCL3 and VCL4 may extend tothe first touch pad unit TP1 via the left side and the lower side of thetouch peripheral area TOA. The third and fourth common voltage linesVCL3 and VCL4 may be connected to the other end of the plurality ofsecond coupling capacitors EMC2. For example, the common voltage of thefirst to fourth common voltage lines VCL1, VCL2, VCL3, and VCL4 may bethe same as the common voltage supplied to the display unit DU, but isnot limited thereto. For another example, the common voltage of at leastone of the first to fourth common voltage lines VCL1, VCL2, VCL3, andVCL4 may be different. A common voltage of a part of the first to fourthcommon voltage lines VCL1, VCL2, VCL3, and VCL4 may have a constantpotential, and a common voltage of another part of the first to fourthcommon voltage lines VCL1, VCL2, VCL3 and VCL4 may be a sine wave, apulse wave, or a ramp wave having a predetermined frequency.

One end of the plurality of driving electrodes TE may be connected tothe driving line TL, and the other end of the plurality of drivingelectrodes TE may be connected to the first coupling capacitor EMC1. Thefirst coupling, capacitor EMC1 may maintain a potential differencebetween the first or second common voltage line VCL1 or VCL2, and theother end of the driving electrodes TE, and thus may stably maintain thepotential of the other end of the driving electrodes TE. The firstcoupling capacitor EMC1 may improve sensing sensitivity at the other endof the driving electrodes TE.

One end of the plurality of sensing electrodes RE may be connected tothe sensing line RL, and the other end of the plurality of sensingelectrodes RE may be connected to the second coupling capacitor EMC2.The second coupling capacitor EMC2 may maintain a potential differencebetween the third or fourth common voltage line VCL3 or VCL4, and theother end of the sensing electrodes RE, and thus may stably maintain thepotential of the other end of the sensing electrodes RE. The secondcoupling capacitor EMC2 may improve sensing sensitivity at the other endof the sensing electrodes RE.

Accordingly, the display device 10 may include the coupling capacitorEMC and the common voltage line VCL disposed in the touch peripheralarea TOA, so that the reliability of the sensor may be secured over theentire area of the touch sensor area TSA.

The display device 10 may sense the touch of the input member 20 byusing the touch sensing unit TSU that senses the touch of the user'sbody. The display device 10 may sense a touch of the user's body duringthe touch sensing period FTS using the touch sensing unit TSU, and maysense the approach or contact of the input member 20 such as an inputpen during the electromagnetic sensing period EMR. Accordingly, thedisplay device 10 may not include a separate sensor layer or a digitizerlayer for the electromagnetic resonance of the input member 20, so thatthe thickness of the display device 10 may be decreased, and the costsmay be reduced.

FIG. 33 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure. The touchsensing unit TSU of FIG. 33 has a different configuration of thecoupling capacitor EMC from the touch sensing unit TSU of FIG. 32 , andthe same configuration as the above-described configuration of FIG. 32will be briefly described or omitted.

Referring to FIG. 33 , the touch sensor area TSA may include theplurality of touch electrodes SEN and the plurality of dummy electrodesDME. The plurality of touch electrodes SEN may include a plurality ofdriving electrodes TE and a plurality of sensing electrodes RE.

The touch peripheral area TOA may include the driving line TL, thesensing line RL, a plurality of coupling capacitors EMC, and theplurality of the common voltage line VCL.

The plurality of coupling capacitors EMC may include a first couplingcapacitor EMC1 and a second coupling capacitor EMC2. The first couplingcapacitor EMC1 may include a first-first coupling capacitor EMC11 and afirst-second coupling capacitor EMC12. The first-first and first-secondcoupling capacitors EMC11 and EMC12 may be disposed on the upper side ofthe touch peripheral area TOA. The first-first and first-second couplingcapacitors EMC11 and EMC12 may be disposed on the opposite side of thedriving line The first-first and first-second coupling capacitors EMC11and EMC12 may be connected to the driving electrodes TE disposedfarthest from the driving line TL. The first-first coupling capacitorEMC11 may be disposed between the driving electrodes TE and the firstcommon voltage line VCL1. The first-second coupling capacitor EMC12 maybe disposed between the driving electrode TE connected to thefirst-first coupling capacitor EMC11 and the second common voltage lineVCL2. One driving electrode TE may be connected to each of thefirst-first and first-second coupling capacitors EMC11 and EMC12.Accordingly, the first coupling capacitor EMC1 may maintain a potentialdifference between the first or second common voltage line VCL1 or VCL2and the driving electrodes TE.

The second coupling capacitor EMC2 may include a second-first couplingcapacitor. EMC21 and a second-second coupling capacitor EMC22. Thesecond-first and second-second coupling capacitors EMC21 and EMC22 maybe disposed on the left side of the touch peripheral area TOA. Thesecond-first and second-second coupling capacitors EMC21 and EMC22 maybe disposed on the opposite side of the sensing line RL. Thesecond-first and second-second coupling capacitors EMC21 and EMC22 maybe connected to the sensing electrodes RE disposed farthest from thesensing line RL. The second-first coupling capacitor EMC21 may bedisposed between the sensing electrodes RE and the third common voltageline VCL3. The second-second coupling capacitor EMC22 may be disposedbetween the sensing electrode RE connected to the second-first couplingcapacitor EMC21 and the fourth common voltage line VCL4. One sensingelectrode RE may be connected to each of the second-first andsecond-second coupling capacitors EMC21 and EMC22. Accordingly, thesecond coupling capacitor EMC2 may maintain a potential differencebetween the third or fourth common voltage line VCL3 or VCL4 and thesensing electrodes RE.

One end of the plurality of driving electrodes TE may be connected tothe driving line TL, and the other end of the plurality of drivingelectrodes TE may be connected to the first coupling capacitor EMC1. Thefirst coupling capacitor EMC1 may maintain a potential differencebetween the first or second common voltage line VCL1 or VCL2, and theother end of the driving electrodes TE, and thus may stably maintain thepotential of the other end of the driving electrodes TE. The firstcoupling capacitor EMC1 may improve sensing sensitivity at the other endof the driving electrodes TE.

One end of the plurality of sensing electrodes RE may be connected tothe sensing line RL, and the other end of the plurality of sensingelectrodes RE may be connected to the second coupling capacitor EMC2.The second coupling capacitor EMC2 may maintain a potential differencebetween the third or fourth common voltage line VCL3 or VCL4, and theother end of the sensing electrodes RE, and thus may stably maintain thepotential of the other end of the sensing electrodes RE. The secondcoupling capacitor EMC2 may improve sensing sensitivity at the other endof the sensing electrodes RE.

Accordingly, the display device 10 may include the coupling capacitorEMC and the common voltage line VCL disposed in the touch peripheralarea TOA, so that the reliability of the sensor may be secured over theentire area of the touch sensor area TSA.

The display device 10 may sense the touch of the input member 20 byusing the touch sensing unit TSU that senses the touch of the user'sbody. The display device 10 may sense a touch of the user's body duringthe touch sensing period FTS using the touch sensing unit TSU, and maysense the approach or contact of the input member 20 such as an inputpen during the electromagnetic sensing period EMR. Accordingly, thedisplay device 10 may not include a separate sensor layer or a digitizerlayer for the electromagnetic resonance of the input member 20, so thatthe thickness of the display device 10 may be decreased, and the costsmay be reduced.

FIG. 34 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure, and FIG. 35is a waveform diagram illustrating a signal applied to the touch sensingunit of FIG. 34 .

Referring to FIGS. 34 and 35 , the touch sensor area TSA may include theplurality of touch electrodes SEN and the plurality of dummy electrodesDME The plurality of touch electrodes SEN may include a plurality ofdriving electrodes TE and a plurality of sensing electrodes RE.

The touch peripheral area TOA may include the driving line TL, thesensing line RL, a plurality of coupling capacitors EMC, and theplurality of the common voltage line VCL.

The plurality of coupling capacitors EMC may include a first couplingcapacitor EMC1. and a second coupling capacitor EMC2. The first couplingcapacitor EMC1 may be disposed on the upper side of the touch peripheralarea TOA. The first coupling capacitor EMC1 may be disposed on theopposite side of the driving line TL. The first coupling capacitor EMC1may be connected to the driving electrodes TE disposed farthest from thedriving line TL. The plurality of first coupling capacitors EMC1 may bedisposed between the driving electrodes TE and the first common voltageline VCL1. Accordingly, the first coupling capacitor EMC1 may maintain apotential difference between the first common voltage line VCL1 and thedriving electrodes TE.

The second coupling capacitor EMC2 may be disposed on the left side ofthe touch peripheral area TOA. The second coupling capacitor EMC2 may bedisposed on the opposite side of the sensing line RL. The secondcoupling capacitor EMC2 may be connected to the sensing electrodes REdisposed farthest from the sensing line RL. The plurality of secondcoupling, capacitors EMC2 may be disposed between the sensing electrodesRE and the second common voltage line VCL2. Accordingly, the secondcoupling capacitor EMC2 may maintain a potential difference between thesecond common voltage line VCL2 and the sensing electrodes RE.

The touch driver 400, during the self-capacitance sensing periodSelf-Cap of the touch sensing period FTS, may supply the plurality offirst driving signals TDS having a first phase to the plurality ofdriving electrodes TE, and may supply the plurality of second drivingsignals RDS having, a first phase to the plurality of sensing electrodesRE. The touch driver 400, during the self-capacitance sensing periodSelf-Cap of the touch sensing period FTS, may supply a first commonvoltage VCM1 having a first phase to the first common voltage line VCL1,and may supply a second common voltage VCM2 having a first phase to thesecond common voltage line VCL2. Accordingly, the plurality of firstdriving signals TDS and the first common voltage VCM1 may have the samephase, and the plurality of second driving signals RDS and the secondcommon voltage VCM2 may have the same phase, so that the touch driver400 may stably maintain the potential of the other end of the driving,electrodes TE and the potential of the other end of the sensingelectrodes RE. The touch driver 400 may sense an amount of change of theself-capacitance of each of the plurality of driving electrodes TE andthe plurality of sensing electrodes RE by receiving the sensing signalfrom each of the plurality of driving electrodes TE and the plurality ofsensing electrodes R during the self-capacitance sensing period Self-Capof the touch sensing period FTS.

The touch driver 400 may supply the plurality of first driving signalsIDS having the first phase to the plurality of driving electrodes TEduring the mutual capacitance sensing period Mutual-Cap of the touchsensing period FTS. The touch driver 400 may supply the first commonvoltage VCM1 having the first phase to the first common voltage lineVCL1 during the mutual capacitance sensing period Mutual-Cap of thetouch sensing period FTS. Accordingly, the plurality of first drivingsignals TDS and the first common voltage VCM1 may have the same phase,so that the touch driver 400 may stably maintain the potential of theother end of the driving electrodes TE. The touch driver 400 may sensean amount of change of the mutual capacitance between the plurality ofdriving electrodes TE and the plurality of sensing electrodes RE byreceiving the sensing signal from the plurality of sensing electrodes REduring the mutual capacitance sensing period Mutual-Cap of the touchsensing period FTS.

The touch driver 400 may supply the second driving signal RDS having thefirst phase to the plurality of sensing electrodes RE during thecharging period of the electromagnetic sensing period EMR. The touchdriver 400 may supply the second common voltage VCM2 having the secondphase to the second common voltage line VCL2 during the charging periodof the electromagnetic sensing, period EMR. The first phase of thesecond driving signal RDS and the second phase of the second commonvoltage VCM2 may be opposite to each other. Accordingly, the potentialdifference across both ends of the second coupling capacitor EMC2 may bedoubled compared to a case where the second common voltage VCM2 has aconstant potential. A current flowing through the second couplingcapacitor EMC2 may be doubled compared to a case where the second commonvoltage VCM2 has a constant potential. The second coupling capacitorEMC2 may improve sensing sensitivity at the other end of the sensingelectrodes RE.

The touch driver 400 may supply the second common voltage VCM2 to thesecond common voltage line VCL2 during the discharging period of theelectromagnetic sensing period EMR. The second common voltage VCM2 mayhave a constant potential during the discharging period of theelectromagnetic sensing period EMR. The touch driver 400 may generate adifferential sensing signal SER by amplifying a voltage differencebetween sensing signals received from the plurality of sensingelectrodes RE. The touch driver 400 may determine whether the input ofthe input member 20 has been made based on the differential sensingsignal SER.

Accordingly, the display device 10 may supply the second driving signalRDS having a first phase and the second common voltage VCM2 having asecond phase opposite to the first phase during the charging period ofthe electromagnetic sensing period EMR, so that the sensing sensitivityat the other end of the sensing electrodes RE may be improved. Thedisplay device 10 may sense the touch of the input member 20 by usingthe touch sensing unit TSU that senses the touch of the user's body, andmay increase the reliability of the sensor over the entire area of thetouch sensor area TSA.

FIG. 36 is a plan view illustrating a touch sensing unit of a displaydevice according to an embodiment of the present disclosure, and FIG. 37is a waveform diagram illustrating a signal applied to the touch sensingunit of FIG. 35 .

Referring to FIGS. 36 and 37 , the touch sensor area ISA may include theplurality of touch electrodes SEN and the plurality of dummy electrodesDME. The plurality of touch electrodes SEN may include a plurality ofdriving electrodes TE and a plurality of sensing electrodes RE.

The touch peripheral area TOA may include the driving line TL, thesensing line RL, a plurality of coupling capacitors EMC, and theplurality of the common voltage line VCL.

The plurality of coupling capacitors EMC may include a first couplingcapacitor EMC1 and a second coupling capacitor EMC2. The first couplingcapacitor EMC1 may be disposed on the upper side of the touch peripheralarea TOA. The first coupling capacitor EMC1 may be disposed on theopposite side of the driving line TL. The first coupling capacitor EMC1may be connected to the driving electrodes TE disposed farthest from thedriving line TL. A part (or first portion) of the plurality of firstcoupling capacitors EMC1 may be disposed between the driving electrodesTE and the first common voltage line VCL1. Another part (or secondportion) of the plurality of first coupling capacitors EMC1 may bedisposed between the driving electrodes TE and the second common voltageline VCL2. For example, the plurality of first coupling capacitors EMCmay be alternately connected to the first or second common voltage lineVCL1 or VCL2 according to a disposed order, but the present disclosureis not limited thereto. Accordingly, the first coupling capacitor EMC1may maintain a potential difference between the first or second commonvoltage line VCL1 or VCL2 and the driving electrodes TE.

The second coupling capacitor EMC2 may be disposed on the left side ofthe touch peripheral area TOA. The second coupling capacitor EMC2 may bedisposed on the opposite side of the sensing line RL. The secondcoupling capacitor EMC2 may be connected to the sensing electrodes REdisposed farthest from the sensing line RL. A part (or first portion) ofthe plurality of second coupling capacitors EMC2 may be disposed betweenthe sensing electrodes RE and a third common voltage line VCL3. Anotherpart (or second portion) of the plurality of second coupling capacitorsEMC2 may be disposed between the sensing electrodes RE and a fourthcommon voltage line VCL4. For example, the plurality of second couplingcapacitors EMC2 may be alternately connected to the third or fourthcommon voltage line VCL3 or VCL4 according to a disposed order, but thepresent disclosure is not limited thereto. Accordingly, the secondcoupling capacitor EMC2 may maintain a potential difference between thethird or fourth common voltage line VCL3 or VCL4 and the sensingelectrodes RE.

The touch driver 400, during the self-capacitance sensing periodSelf-Cap of the touch sensing period FTS, may supply the plurality offirst driving signals TDs having a first phase to the plurality ofdriving electrodes TE, and may supply the plurality of second drivingsignals RDS having a first phase to the plurality of sensing electrodesRE. The touch driver 400, during the self-capacitance sensing periodSelf-Cap of the touch sensing period FTS, may supply a first commonvoltage VCM1 having a first phase to the first common voltage line VCL1,and may supply a second common voltage VCM2 having a first phase to thesecond common voltage line VCL2. The touch driver 400, during theself-capacitance sensing period Self-Cap of the touch sensing periodFTS, may supply a third common voltage VCM3 having a first phase to thethird common voltage line VCL3, and may supply a fourth common voltageVCM4 having a first phase to the fourth common voltage line VCL4.Accordingly, the plurality of first driving signals TDS and the first orsecond common voltage VCM1 or VCM2 may have the same phase, and theplurality of second driving signals RDS and the third or fourth commonvoltage VCM3 or VCM4 may have the same phase, so that the touch driver400 may stably maintain the potential of the other end of the drivingelectrodes TE and the potential of the other end of the sensingelectrodes RE. The touch driver 400 may sense an amount of change of theself-capacitance of each of the plurality of driving electrodes TE andthe plurality of sensing electrodes RE by receiving the sensing signalfrom each of the plurality of driving electrodes TE and the plurality ofsensing electrodes RE during the self-capacitance sensing periodSelf-Cap of the touch sensing period FTS.

The touch driver 400 may supply the plurality of first driving signalsTDS having the first phase to the plurality of driving electrodes TEduring the mutual capacitance sensing period Mutual-Cap of the touchsensing period FTS. The touch driver 400, during the mutual-capacitancesensing period Self-Cap, may supply a first common voltage VCM1 having afirst phase to the first common voltage line VCL1, and may supply asecond common voltage VCM2 having a first phase to the second commonvoltage line VCL2. Accordingly, the plurality of first driving signalsTDS and the first or second common voltage VCM1 or VCM2 may have thesame phase, so that the touch driver 400 may stably maintain thepotential of the other end of the driving electrodes TE. The touchdriver 400 may sense an amount of change of the mutual capacitancebetween the plurality of driving electrodes TE and the plurality ofsensing electrodes RE by receiving the sensing signal from the pluralityof sensing electrodes RE during the mutual capacitance sensing periodMutual-Cap of the touch sensing period FTS. The third or fourth commonvoltage VCM3 or VCM4 may not be applied during the mutual capacitancesensing period Mutual-Cap of the touch sensing period FTS. Similarly,the second driving signals RDS may not be applied during the mutualcapacitance sensing period Mutual-Cap of the touch sensing period FTS.

The touch driver 400, during the charging period of the electromagneticsensing period EMR, may supply a second-first driving signal RDS1 havinga first phase to one sensing electrode RE among the plurality of sensingelectrodes RE, and may supply a second-second driving signal RDS2 havinga second phase to the other sensing electrode RE among the plurality ofsensing electrodes RE. Here, the sensing electrode RE receiving thesecond-first driving signal RDS1 may be the sensing electrode REdisposed on one side of the specific point PT, and the sensing electrodeRE receiving the second-second driving signal RDS2 may be the sensingelectrode RE disposed on the other side of the specific point PT. Thefirst phase of the second-first driving signal RDS1 and the second phaseof the second-second driving signal RDS2 may be opposite to each other.Accordingly, the direction of the magnetic field of each of the sensingelectrodes RE disposed on both sides of the specific point PT maycoincide at the specific point PT, so that a magnetic field may begenerated according to the constructive interference of the magneticfield, to charge the input member 20.

The touch driver 400, during the charging period, may supply the thirdcommon voltage VCM3 having a second phase to the third common voltageline VCL3, and may supply the fourth common voltage VCM4 having a firstphase to the fourth common voltage line VCL4. The first phase of thesecond-first driving signal RDS1 and the second phase of the thirdcommon voltage VCM3 may be opposite to each other. A second phase of thesecond-second driving signal RDS2 and a first phase of the fourth commonvoltage VCM4 may be opposite to each other. Accordingly, the potentialdifference across both ends of the second coupling capacitor EMC2 may bedoubled compared to a case where the third or fourth common voltage VCM3or VCM4 has a constant potential. The current flowing through the secondcoupling capacitor EMC2 may be doubled compared to a case where thethird or fourth common voltage VCM3 or VCM4 has a constant potential.The second coupling capacitor EMC2 may improve sensing sensitivity atthe other end of the sensing electrodes RE.

The touch driver 400, during the discharging period of theelectromagnetic sensing period EMR, may supply the third common voltageVCM3 to the third common voltage line VCL3, and may supply the fourthcommon voltage VCM4 to the fourth common voltage line VCL4. During thedischarging period, each of the third and fourth common voltage linesVCL3 and VCL4 may have a constant potential. The touch driver 400 mayreceive a first sensing signal from the sensing electrode RE disposed onone side of the specific point PT, and may receive a second sensingsignal from the sensing electrode RE disposed on the other side of thespecific point PT. The touch driver 400 may determine whether the inputof the input member 20 has been made based on the differential sensingsignal SER obtained by amplifying the voltage difference between thefirst and second sensing signals.

Accordingly, the display device 10, during the charging period of theelectromagnetic sensing period EMR, may supply the second-first drivingsignal RDS1 having a first phase and the second-second driving signalRDS2 having a second phase, the third common voltage VCM3 having thesecond phase, and the fourth common voltage VCM4 having the first phase,so that the sensing sensitivity at the other end of the sensingelectrodes RE may be improved. The display device 10 may sense the touchof the input member 20 by using the touch sensing unit TSU that sensesthe touch of the user's body, and may increase the reliability of thesensor over the entire area of the touch sensor area TSA.

What is claimed is:
 1. A display device, comprising: a display unithaving a plurality of pixels; a plurality of touch electrodes disposedon the display unit; a touch line connected to a first end of each ofthe plurality of touch electrodes; a common voltage line spaced apartfrom the plurality of touch electrodes; and a plurality of switchingelements connected between the common voltage line and a second end ofeach of the plurality of touch electrodes, wherein the plurality oftouch electrodes comprise a driving electrode extending in a firstdirection, and a sensing electrode extending in a second directioncrossing the first direction, wherein the touch line comprises a drivingline connected to a first end of the driving electrode, and a sensingline connected to a first end of the sensing electrode, wherein theplurality of switching elements comprise: a first switching transistorconnected to a second end of the driving electrode; and a secondswitching transistor connected to a second end of the sensing electrode.2. The display device of claim 1, further comprising a touch driverconfigured to sense an input of a user's body by driving the pluralityof touch electrodes during a first period, and to sense an input of aninput device by driving the plurality of touch electrodes during asecond period different from the first period.
 3. The display device ofclaim 2, further comprising a display driver configured to display animage by driving the plurality of pixels during a display period,wherein the display period overlaps the first and second periods.
 4. Thedisplay device of claim 2, further comprising an electromagnetic controlline connected to a gate electrode of each of the plurality of switchingelements.
 5. The display device of claim 4, wherein the electromagneticcontrol line supplies a control signal of a gate-off level to theplurality of switching elements during the first period, and supplies acontrol signal of a gate-on level to the plurality of switching elementsduring the second period.
 6. The display device of claim 1, wherein thedisplay unit comprises: a substrate; a thin film transistor layerdisposed on the substrate and comprising a plurality of thin filmtransistors and the plurality of switching elements; and a lightemitting element layer disposed on the thin film transistor layer andcomprising a plurality of light emitting elements, wherein the pluralityof switching elements are connected to the second end of each of theplurality of touch electrodes through at least one connection electrode.7. The display device of claim 1, wherein the plurality of touchelectrodes comprises: a driving electrode extending in a first directionin a first metal layer; a sensing electrode extending in a seconddirection crossing the first direction in the first metal layer; and abridge electrode connecting the driving electrode in a second metallayer different from the first metal layer, wherein the common voltageline is disposed in the thin film transistor layer, the first metallayer, or the second metal layer.
 8. The display device of claim 1,wherein the common voltage line comprises a first common voltage lineand a second common voltage line, wherein the first switching transistoris connected between the first common voltage line and the second end ofthe driving electrode; and the second switching transistor is connectedbetween the second common voltage line and the second end of the sensingelectrode.
 9. The display device of claim 8, further comprising: a firstelectromagnetic control line connected to a gate electrode of each ofthe plurality of first switching transistors; and a secondelectromagnetic control line connected to a gate electrode of each ofthe plurality of second switching transistors, wherein the firstelectromagnetic control line supplies a first control signal of agate-on level to the plurality of first switching transistors during afirst period, and the second electromagnetic control line supplies asecond control signal of a gate-on level to the plurality of secondswitching transistors during a second period after the first period. 10.The display device of claim 1, further comprising: a first extensionline connected to the second end of the driving electrode; and a secondextension line connected to the second end of the sensing electrode,wherein the first switching transistor is connected between the firstextension line and the common voltage line; and the second switchingtransistor is connected between the second extension line and the commonvoltage line.
 11. A display device, comprising: a display unit having aplurality of pixels; a plurality of touch electrodes disposed on thedisplay unit; a touch line connected to a first end of each of theplurality of touch electrodes; a common voltage line spaced apart fromthe plurality of touch electrodes; and a plurality of switching elementsconnected between the common voltage line and a second end of each ofthe plurality of touch electrodes, wherein the plurality of touchelectrodes comprise a driving electrode extending in a first direction,and a sensing electrode extending in a second direction crossing thefirst direction, wherein the touch line comprises a driving lineconnected to a first end of the driving electrode, and a sensing lineconnected to a first end of the sensing electrode, wherein the displaydevice further comprises: a first extension line connected to the secondend of the driving electrode; and a second extension line connected tothe second end of the sensing electrode, wherein the plurality ofswitching elements include: a first demultiplexer for connecting thefirst extension line to the common voltage line or the driving line; anda second demultiplexer for connecting the second extension line to thecommon voltage line or the sensing line.
 12. A sensing system,comprising: a display device for displaying an image; and wherein thedisplay device comprises: a display unit having a plurality of pixels; aplurality of touch electrodes disposed on the display unit; a touch lineconnected to a first end of each of the plurality of touch electrodes; acommon voltage line disposed away from the plurality of touchelectrodes; a plurality of switching elements connected between thecommon voltage line and a second end of each of the plurality of touchelectrodes; and a touch driver configured to sense an input of a user'sbody by driving the plurality of touch electrodes during a first period,and to sense an input of an input member by driving the plurality oftouch electrodes during a second period different from the first period,wherein the touch driver supplies a first driving signal having a firstphase to at least one touch electrode disposed on a first side of apoint among the plurality of touch electrodes, and supplies a seconddriving signal having a second phase opposite to the first phase to atleast one touch electrode disposed on a second side of the point amongthe plurality of touch electrodes, and the touch driver receives a firstsensing signal having the first phase from at least one touch electrodedisposed on the first side of the point, and receives a second sensingsignal having the second phase from at least one touch electrodedisposed on the second side of the point.
 13. The sensing system ofclaim 12, wherein the input member is charged by an electromagneticresonance method when the first and second driving signals are disposedon the point during a second-first period in which the first and seconddriving signals are supplied to the plurality of touch electrodes, theinput member is discharged when a supply of the first and second drivingsignals is stopped during a second-second period immediately after thesecond-first period, and the touch driver receives a first sensingsignal having the first phase from at least one touch electrode disposedon the first side of the point during the second-second period, andreceives a second sensing signal having the second phase from at leastone touch electrode disposed on the second side of the point.